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Genex Research Limited

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GX8500 Operational Manual… … … … … … … … … … … … … … … … … … … … … … … … … … … … …

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GX8500 Operational manual Rev 1.0 Contents

Genex Research Limited i

CONTENTS

CONTENTS............................................................................................................................................. I

IMPORTANT NOTES............................................................................................................................. 1

LAYOUT OF THIS MANUAL ................................................................................................................. 3

INTRODUCTION TO THE GX8500........................................................................................................ 4

OPTIONS............................................................................................................................................... 5

PANEL DESCRIPTION.......................................................................................................................... 6

MENU OPERATION............................................................................................................................. 13

Displaying and Navigating the Menu............................................................................................. 13Changing Menu Levels.................................................................................................................. 13Changing the Value of a Menu Option .......................................................................................... 14

PROJECTS AND PRESETS................................................................................................................ 15

What is a Project? ......................................................................................................................... 15What is a Preset? .......................................................................................................................... 15

PROJECT MANAGEMENT ...................................................................................................................... 15New project.................................................................................................................................... 15Open project .................................................................................................................................. 15Save as Project ............................................................................................................................. 16Character Mode............................................................................................................................. 16 Delete Project....................................................................................................................... 16Rename Project............................................................................................................................. 16 Backup.......................................................................................................................................... 17Auto Save ...................................................................................................................................... 18

PRESETS ............................................................................................................................................ 19Save Preset ................................................................................................................................... 19Recall Preset ................................................................................................................................. 19

PROJECT DATA ................................................................................................................................... 19Date ............................................................................................................................................... 20Time............................................................................................................................................... 20

AUDIO .................................................................................................................................................. 21

AUDIO FORMATS ................................................................................................................................. 21Input Format .................................................................................................................................. 21Input Configuration ........................................................................................................................ 21Bits In............................................................................................................................................. 22Bits Out and Dither ........................................................................................................................ 22Global Source setup...................................................................................................................... 23

AUDIO ROUTING .................................................................................................................................. 24Input Routing ................................................................................................................................. 24Disk Routing .................................................................................................................................. 25

DIGITAL CLOCKS ............................................................................................................................... 26

Clock Source ................................................................................................................................. 26Clock (Sample) Rate ..................................................................................................................... 26

PLAYBACK.......................................................................................................................................... 28

AUDIO PLAYBACK ................................................................................................................................ 28REPEAT PLAYBACK.............................................................................................................................. 28

Spool Track Preferences............................................................................................................... 29USING HEADPHONES ........................................................................................................................... 30


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Setting up the Internal Monitor Mixer ............................................................................................ 30Adding Tracks into the mix ............................................................................................................ 30Mixer phase invert ......................................................................................................................... 30

MIXER................................................................................................................................................. 31Pan Centre Depth.......................................................................................................................... 31Set the Monitor Mixer Bits per Sample.......................................................................................... 31Applying Dither to the Monitor Mix Output .................................................................................... 31

TRACK SLIPPING ................................................................................................................................. 32Selecting the track slip units.......................................................................................................... 32Performing track slip...................................................................................................................... 32Selectable track slip increments.................................................................................................... 33

LOCATING ........................................................................................................................................... 33Locating Using Timecodes ............................................................................................................ 33Locating Using Cue Points ............................................................................................................ 33Locate Memories........................................................................................................................... 33+/- 10 Secs Buttons ....................................................................................................................... 34Previous / Next Buttons................................................................................................................. 34Adjusting Locate Memories Using the Scrub Wheel ..................................................................... 34

RECORDING........................................................................................................................................ 36

MEDIA FORMATS ................................................................................................................................. 36Disk Format ................................................................................................................................... 36File Format .................................................................................................................................... 36Format Disk/Drive.......................................................................................................................... 36

AUDIO RECORDING.............................................................................................................................. 37Recording Mode ............................................................................................................................ 37Linear and Non Linear recording................................................................................................... 37Linear Modes................................................................................................................................. 37Assemble....................................................................................................................................... 37Insert.............................................................................................................................................. 37Non Linear Modes ......................................................................................................................... 38Non Linear ..................................................................................................................................... 38Packed Non Linear ........................................................................................................................ 38

MAKING INITIAL RECORDINGS .............................................................................................................. 39Number of Tracks.......................................................................................................................... 40Track Arm in Record...................................................................................................................... 40

PUNCH IN RECORDING......................................................................................................................... 41Setting In and Out points using the IN and OUT buttons.............................................................. 41Setting In and Out points using the REHEARSE button. .............................................................. 41Adjusting the In or Out Points........................................................................................................ 42Rehearsal ...................................................................................................................................... 42Auto Punch In ................................................................................................................................ 42Manual Punch In and Out.............................................................................................................. 43

PRE AND POST ROLL ........................................................................................................................... 43Preroll ............................................................................................................................................ 43Postroll........................................................................................................................................... 43

CROSS FADING ................................................................................................................................... 44Cross Fade Shape......................................................................................................................... 44Cross Fade length ......................................................................................................................... 44

HIGH SAMPLE RATE RECORDING ......................................................................................................... 45176.4kHz and 192kHz Sample Rates ........................................................................................... 45

SYNCHRONISATION........................................................................................................................... 46

TIMECODE........................................................................................................................................... 46Synchronisation source ................................................................................................................. 46Timecode Format .......................................................................................................................... 46Timecode Generator ..................................................................................................................... 46Stop Timecode .............................................................................................................................. 47Chase Locking............................................................................................................................... 47Flywheel ........................................................................................................................................ 48


Genex Research Limited iii

Biphase rate control....................................................................................................................... 48Adding an Offset............................................................................................................................ 48Automatically Calculating an Offset............................................................................................... 48Presetting a time code................................................................................................................... 49

EDITING ............................................................................................................................................... 50

Cut ................................................................................................................................................. 50Copy .............................................................................................................................................. 50Paste ............................................................................................................................................. 50Erase ............................................................................................................................................. 51Delete ............................................................................................................................................ 51Program Play................................................................................................................................. 51Undo and Redo ............................................................................................................................. 52Undo .............................................................................................................................................. 52Redo .............................................................................................................................................. 52

CONTROL............................................................................................................................................ 53

Local /Remote ............................................................................................................................... 53RS422 Controller / Controlled ....................................................................................................... 53RS422 Emulation........................................................................................................................... 54Parallel I/O..................................................................................................................................... 55

MULTI MACHINE OPERATION................................................................................................................ 57

THE GX8500 TAKE LOGGING SYSTEM ........................................................................................... 59

ENTERING CUE POINTS ....................................................................................................................... 60Adjusting the Cue Point Timecode Using the Jog Wheel.............................................................. 61Deleting Cue Points....................................................................................................................... 61Renumbering Cue Points .............................................................................................................. 62

SCSI...................................................................................................................................................... 63

Current Drive ................................................................................................................................. 63DSP/Initiator SCSI ID .................................................................................................................... 63Playing and Recording with an External Drive .............................................................................. 63Increasing Recording Capacity using External Drives .................................................................. 63

DISPLAY .............................................................................................................................................. 65

Timecode Display.......................................................................................................................... 65Film Beginning............................................................................................................................... 65Film Stock Type............................................................................................................................. 65PPM peak ...................................................................................................................................... 65PPM over....................................................................................................................................... 66PPM Scale..................................................................................................................................... 66Frames on/off ................................................................................................................................ 66

SADIE................................................................................................................................................... 67

Sadie Profiles ................................................................................................................................ 67Sadie Partition ............................................................................................................................... 67Sadie Emulation ............................................................................................................................ 67

SYSTEM ............................................................................................................................................... 68

DIAGNOSTICS...................................................................................................................................... 68Serial Number................................................................................................................................ 68Software / FPGA Revision............................................................................................................. 68Drive type ...................................................................................................................................... 69Timecode Analysis ........................................................................................................................ 69Sine Wave Generation .................................................................................................................. 69Ethernet ID .................................................................................................................................... 69Downloading new firmware to a GXR48 ....................................................................................... 70RS232 v. RS422............................................................................................................................ 70

DOWNLOADING NEW SOFTWARE VIA THE INTERNET.............................................................................. 71


Genex Research Limited iv

GXR Remote Software................................................................................................................. 71GX8500 Firmware ......................................................................................................................... 72

UPLOADING NEW FIRMWARE TO THE GX8500 ...................................................................................... 72

CONNECTIONS ................................................................................................................................... 74

RS422 CONNECTOR PINOUT............................................................................................................... 74RS232 CONNECTOR PINOUT............................................................................................................... 74LINK CONNECTOR PINOUT.................................................................................................................. 75REAR PANEL 25 WAY D' TYPE PINOUTS .............................................................................................. 76

DSD INPUT .................................................................................................................................. 76DSD OUTPUT ............................................................................................................................... 76AES I/O.......................................................................................................................................... 76

REAR PANEL 25 WAY D' TYPE PINOUTS .............................................................................................. 77REAR PANEL MULTIPORT PINOUT..................................................................................................... 78REAR PANEL ( NO OPTIONS FITTED) ..................................................................................................... 79REAR PANEL ( ANALOGUE OPTIONS FITTED) ......................................................................................... 80

GX8500 Operational manual Rev 1.0 Important notes

Genex Research Limited 1

Important notes

UnpackingAfter unpacking the GX8500, save all the packing materials in case you everneed to ship the unit. Thoroughly inspect the GX8500 for signs of damage.Report any shipment damage to the carrier at once. The followingaccessories are included with the GX8500;

1. 3.5" floppy disk containing the GXR Remote PC software.

2. Power Cable.

3. User Guide.

4. Four mounting feet and screws.

5. Four rack mounting bolts.

Power• This unit is equipped with a dual range power supply (98-135Vac or 170-

265Vac auto selected),

• Make sure that the unit is turned off before connecting the power plug tothe socket.

• Please be sure to connect the power cord to the AC inlet on this unitbefore connecting the power plug to the socket.

• When disconnecting the power plug from the socket, do not pull the cordbut hold the plug to avoid damaging the cord.

• Avoid damaging the power cord.

• If the unit is not to be used for a long period of time, unplug the cord fromthe socket.

• It is normal for this unit to become hot while being operated.

Location• Avoid using this device in extreme heat, humidity or where it may be

affected by dust or vibration.

• Do not place or drop anything heavy on the unit or its power cable.

Shipping Considerations• MO disk drives are equipped with an Auto Carriage Lock feature which

will be activated when no disk is inside the drive and the power isdisconnected. No shipping cartridge is required.

• Do not transport a GX8500 with a data cartridge loaded in it. Doingso will damage the disk drives internal mechanism.

GX8500 Operational manual Rev 1.0 Important notes


Mounting Positions

Do not mount the GX8500 upside down, or inclined at an angle of greaterthan 5 degrees to the horizontal.

Conformity

The GX8500 bears the 'CE' mark and is therefore fully compliant. Testsperformed and passed are as follows,

EN50082-1: 1992

EN55022: 1994 Class A

Technical Support

Technical Support is available on line through the Genex web site at

http://www.genex.co.uk/

or by emailing

[email protected].

GX8500 Operational manual Rev 1.0 Layout of this manual


Layout of this ManualSections in this manual appear in the following order.

1. A brief introduction to the feature set and a list of options.

2. A detailed front panel description with a functional description of everyfront panel button and display. This section should be used as a quickguide and reminder to basic front panel operations.

3. A brief description of how to use the Setup menu is followed by anexplanation of how projects and presets are supported.

4. A description of the audio formats supported and how to alter relatedparameters using the setup menu.

5. An explanation of the clock structure together with related menu headings.

6. Issues relating to playback of previously recorded audio, includingdifferent locating techniques and a description of how to configure themonitor mixer and headphone output. Track slipping is also included here.

7. Issues related to disk formats and recording, highlighting the differentrecord modes, punching in and out, rehearsing and high sample raterecording.

8. An explanation of timecodes and chase synchronisation.

9. A description of the editing functions available and how to access them.

10. Control via the RS232 and RS422 ports together with a description of theparallel control interface.

11. A description of the take logging system and associated menu headings.

12. SCSI related issues including multiple drive support.

13. A description of how to stack multiple machines from a hardware andsoftware perspective.

14. Menu settings that alter the information fed to the front panel displays

15. A brief explanation of the Sadie digital audio workstation interface viaSCSI.

16. A description of the diagnostics menu headings, including a description ofhow to upgrade the machine with new software updates.

17. Rear panel schematics and connector details

GX8500 Operational manual Rev 1.0 Introduction to the GX8500


Introduction to the GX8500

DescriptionThe GX8500 is a professional eight track, multiformat, SCSI based recorder,packaged in a 3U, 19" rack mounting unit. All functions are accessible fromthe front panel and relevant information is displayed on two eight characteralpha-numeric displays.

The enhanced feature set makes the GX8500 suitable for a wide range ofrecording applications, from film dubbing and scoring to archiving, masteringand location recording.

The GX8500 can accept audio data in a variety of audio formats, eitherAES3, IEC958, SDIF2, DSD or analogue using the optional internal 24 bit,96kHz ADC.

The GX8500 can record audio at resolutions of 16, 20 or 24 bits per sample(an effective dynamic range of 144dB). Sample rates can be adjusted from32kHz to 192kHz, with actual clock rates up to and including 96kHz.

Software is included that allows control of the unit by a remote PC runningWindows 3.XX, 95 and NT4 software. The remote PC software allows moresophisticated control of the recorder than that offered by the front panelalone. In addition a takebook and session logging module are included, andalso the ability to store and recall non-audio data to and from the disk.

An 8 channel digital mixer is built in to the recorder. The output of the mixer isfed through a 24Bit, 96kHz D/A converter to the headphone output on thefront panel, and digitally to an AES XLR connector at the rear of the unit. Youcan alter the gain, phase and stereo position of each channel in the monitormix.

You can chase audibly forwards and backwards against timecode and/orbiphase with instant lock and at any speed.

Individual tracks can be delayed or slipped relative to other tracks down tosample resolution. Tracks can also be combined and slipped together.

The GX8500 can simultaneously record up to 8 tracks, of 24 bit 96kHz audiowith seamless punch in and out and user adjustable cross fade size andshape.

The unit can record in linear and non linear modes. Linear recordings aredestructive and emulate existing tape based recorders. Non linear recordingsare non destructive and can be undone and edited using cut, copy and pastefunctions.

The GX8500 supports a range of disk and file formats from the proprietaryGenex format for compatibility with the GX8000 to FAT32, BWAV, UDF,HFS+ and AIFF.

User defined presets and projects are supported and maintained by asophisticated but simple to use file handling system. Up to 199 differentprojects can exist on a disk or drive.

The unit can record and playback from any SCSI based storage device, andcan merge two storage devices for increasing record capacity in liverecording environments.

Up to six recorders can be locked together with sample accuracy to provide apowerful multitrack solution, especially when used in combination with theGXR48 Hardware Remote Controller

GX8500 Operational manual Rev 1.0 Panel Description


A 10Mbs Ethernet port allows for high speed transfer and streaming of audioto other recorders or computer based audio devices or even the internet.

Options• 8 channel 24bit/ 96KHz analogue to digital convertors.

• 8 channel 24bit/ 96KHz digital to analogue convertors.

• AES break out cable, (D-type to XLR).

• DSD break in/out cables, (D-type to BNC).

• SDIF2 break in/out cables, (D-type to BNC).

• ANALOGUE break in/out cables, (D-type to XLR)

• PC to RS232 cable.

• GX8500 Link cable.

• GXR48, 48 Channel Remote Controller.



Panel description

12

34

56

78

91

011

12

13

1415

16

171

81

92

02

12

22

324

25

26

27

282

93

03132

3334

35

36

3738

39

4041

424

34

445

46



1. 10 SECSThis button locates to a point 10 secondsbefore the current timecode. If therecorder is in play when the button ispressed, playback continues at the newtimecode, otherwise the recorder is parkedat the new timecode

2. +10 SECSThis button locates to a point 10 secondsafter the current timecode. If the recorderis in play when the button is pressed,playback continues at the new timecode,otherwise the recorder is parked at thenew timecode

3. PREVIOUSThis button locates to the previous cuepoint.If the recorder was in play when the buttonwas pressed, playback continues at thenew timecode, otherwise the recorder isparked at the new timecode.The button auto repeats if held and willcontinue to select previous cue points untilreleased.The type of cue point located by thisbutton is set in the 'ref cue' menu heading.For example, if 'ref cue' is set to take,pressing previous steps through all of thetake points on disk.The PREVIOUS button in combinationwith the RECORD button can also be usedto undo previous edits or overdubs.

4. NEXTThis button selects the cue point after thecurrent cue point on disk, unless thecurrent cue point is the last cue point, inwhich case no action is taken.If the recorder was in play when the buttonwas pressed, playback continues at thenew timecode, otherwise the recorder isparked at the new timecode.The button auto repeats if held and willcontinue to select next cue points untilreleased.The type of cue point located by thisbutton is set in the 'ref cue' menu heading.For example, if 'ref cue' is set to take,pressing next steps through every takepoints on disk.The NEXT button in combination with theRECORD button can also be used to undoprevious edits or overdubs.

5. FREVIf pressed and released this button startsplayback in reverse at 5 times real time. Ifthe disk access time is too slow to allowfast reverse from all tracks at once,playback will be from the track selectedunder the ‘spool track preference’ menuheading. Each subsequent pressing of thebutton will increase the spool rate until x50is reached. Increments are x10, x20, x30,x40 and x50.Pressing and holding the FREV button forlonger than approx. 1 second will play inreverse at x5 for as long as the button isheld.

6. REV PLAYThis button puts the recorder into reverseplay from the current timecode.

7. STOPThis button stops the recorder if thecurrent state is record or playback.The stop button illuminates for this statewhich is the power up state of the unit.

8. PLAYThis button puts the recorder into playfrom the current timecode. The play buttonilluminates green if playback is possible.

9. FFWDIf pressed and released the FASTFORWARD button starts playbackforwards at 5 times real time. If the diskaccess time is too slow to allow fastforward from all tracks at once, playbackwill be audible only from the track selectedunder the ‘spool track preference’ menuheading. Each subsequent pressing of thebutton will increase the spool rate until x50is reached. Increments are x5, x10, x20,x30, x40 and x50.Pressing and holding the FFWD button forlonger than approx. 1 second will playforwards at x5 for as long as the button isheld.

10. RECORDEither holding the PLAY button down andpressing RECORD or holding theRECORD button and pressing PLAY putsthe machine into record

The RECORD button illuminates red andthe PLAY button illuminates green whilerecording.



11. TRACK CONTROL BUTTONSThe function of these buttons isdetermined by the buttons immediatelybelow the track control buttons, e.g., if theled above the REC EN button is on, thenthe buttons control the record enablefunction for each track.

12. CUEThis button allows track control buttons 1to 4 to add cue points when in record.Track button 1 adds a take point, button 2adds a false start, button 3 adds a notepoint and button 4 adds an end point.

13. MIXThis button allows the track control buttonsto add or subtract signals to or from theinternal digital monitor mixer. Pressing thebutton displays fader and pan settings inthe alpha numeric displays.To alter the mixer settings, select achannel using the PARAMETER buttons.Use the rotary control knob to adjust thegain of the channel, and the VALUEbuttons to alter the pan setting. The panvaries between full left represented by 'l',centre, represented by '[]', and full rightrepresented by 'r'. The -/CLEAR and+/STORE buttons can be used to phaseinvert the selected channel. Phaseinversion is represented by the phasesymbol before the gain setting.

14. REHEARSEPressing this button while the unit is instop rehearses an overdub. The recorderlocates to the in point minus the prerolltime and starts playback. At the in pointthe unit switches to input monitoring forthe tracks that are record armed. At theout point monitoring reverts back to offdisk. Playback continues for the postrollperiod.Pressing the button while the unit is in playenters an in point and switches themonitoring for tracks that are recordarmed. Press the button a second time toenter an out point and switch themonitoring back.

15. REC ENThis button allows the track control buttonsto set any of the tracks to the record readyposition, or directly into record if the recordand play buttons are previously pressed.The record enable LED's flash to indicaterecord ready, and stay on permanently toindicate record. If no track control buttonsare pressed for five seconds the led for

this button turns off to prevent tracks beingaccidentally dropped in and out of record.

16. AUTO (input)The AUTO button has two modesindicated by a solid or flashing led.Thisbutton routes the inputs to the tracks thathave previously been set to record readydirectly to the outputs. See the table belowfor a description of output signals fordifferent transport modes and switchsettings

RECORDENABLE ON ON OFF OFF

AUTOINPUT ON OFF ON OFF

PLAY DISK DISK DISK DISK

RECORD INPUT INPUT DISK DISK

SHUTTLE INPUT DISK DISK DISK

STOP INPUT MUTE MUTE MUTE

RECORDENABLE ON ON OFF OFF

AUTOINPUT ON OFF ON OFF

PLAY INPUT DISK DISK DISK

RECORD INPUT INPUT DISK DISK

SHUTTLE INPUT DISK DISK DISK

STOP INPUT MUTE MUTE MUTE

17. ALL (input)This button routes the inputs to all tracksdirectly to the outputs.

18. T/C ARMThis button arms the timecode track forlinear record modes.

19. RECORD ENABLE LED'SThe record enable LED's flash to indicaterecord ready, and stay on permanently toindicate record.



20. ROTARY CONTROL KNOB [P]The rotary control knob is multi-function.If the jog led is on, turning the knob givesan audio scrub effect, similar to thatobtained by slowly moving the reels on ananalogue tape recorder. If an in point orout point is displayed, the point can be finetuned audibly with the scrub function.If the shuttle led is on, turning the knobshuttles the recorder forwards andbackwards at a variable rate from still tox5. Turning the knob to the right movesthe recorder in a forward direction, turningto the left moves in a reverse direction.The centre position pauses the recorder atthe current timecode.If the varispeed led is on, turning the knobadjusts the playback rate of the disk.In addition the knob can be used to controlother parameters including mixer fadersettings, track slip delays, timecode offsetvalues, in point and out point timecodes.

21. ROTARY CONTROL KNOB FUNCTIONSELECTThis button controls the function of therotary control knob. Repeated pressingselects jog, shuttle, varispeed and off inturn, as indicated by the led's to the rightof the button.

Jog Press the FUNCTION SELECTbutton until the jog led is on. Turning therotary control knob plays back from thedisk at a variable rate, depending uponhow fast you turn the knob. The effect issimilar to rock and roll on an analogue reelto reel tape machine. Jog can be used toaudibly locate an edit point prior to punchin or editing.ShuttlePress the FUNCTION SELECT buttonuntil the shuttle led is on. The lower alphanumeric display shows the current spoolrate (x00 is stop). The available spoolrates in forward and reverse are

x.25, x.5, x.75, x01, x02 up to and including x5.

Use the rotary control knob to adjust thespool rate. All shuttle speeds from 0 to1.25 are available via an RS422 P2equipped controller.VarispeedPress the FUNCTION SELECT buttonuntil the varispeed led is on.The GX8500 has the ability to play back ata variable rate. The variable rate isadjustable in 0.02% steps using the rotarycontrol knob.

Varispeed operation is only possiblewhen the internal master clock isselected.The lower alphanumeric display shows thepercentage deviation from nominal.Varispeed playback alters the outputdata rate. If you are using an externalD/A convertor you must make sure thatthe device can lock over the varispeedrange required. The total varispeedrange of the GX8500 is approximately+/-12.5%.

22. OUTPressing this button while the recorder isin play enters an out point at the currenttimecode. The timecode associated withthe out point is displayed in the alphanumeric display. Pressing the button whilethe recorder is not in play recalls anddisplays the last entered out point, so thatit can be altered using the rotary controlknob.

23. INPressing this button while the recorder isin play enters an in point at the currenttimecode. The timecode associated withthe in point is displayed in the alphanumeric display. Pressing the button whilethe recorder is not in play recalls anddisplays the last entered in point, so that itcan be altered using the rotary controlknob.

24. CUE COUNTThis button allows the user to set thenumber associated with each of the fourselectable cue points, take, false start,note and end. The number shown in thealpha numeric display represents thenumber that will be entered when theassociated cue point button is nextpressed. The number is altered byselecting the required cue point type usingthe PARAMETER buttons and entering thenew number using the NUMERICKEYPAD.

25. REPEATThe REPEAT button allows you to loop asection of audio for repeated playback, orto repeat a rehearsal or punch in/outindefinitely. Pressing the button displays'repeat' in the alpha numeric display.While this message is displayed, pressingPLAY with the auto in/out led off, causesthe recorder to play from the In point to theOut point and then repeat indefinitely. Theloop can be interrupted by pressing STOP.The loop function can be cancelled bypressing the REPEAT button again.



26. AUTO IN/OUTThis button allows an automated drop in,which includes preroll to an in point, recordto an out point and play to a post roll point.

27. SLIPThis button allows the user to slip or delayindividual tracks. Pressing the button oncedisplays the current track slip settings inthe alpha numeric display. Use thePARAMETER buttons to select the trackto be altered and the VALUE buttons orthe ROTARY CONTROL KNOB to alterthe slip value. The value can be alteredwith the recorder in stop or play. Pressand hold the SLIP button to alter the trackslip increment by using the jog wheel.

28. NUMERIC KEYPADThe keypad is used to enter data valuesfor setup parameters. The -/CLEAR buttonreturns the recorder to the defaulttimecode display from any mode.

The keypad also allows access to thetimecode locate memories. Pressingnumber buttons while the recorder is inbasic timecode display mode, recalls oneof the 100 locate memories. The recalledtimecode is displayed in the alpha numericdisplay. Pressing PLAY while thistimecode is displayed plays from therecalled timecode and returns the displayto default timecodeThe first 10 locate memories are predefined and are not alterable. These are,00 Lst rec Last record point.01 Lst ply Last play point.02 Lst stp Last stop point.03 Lst loc Last locate point.04 Lst in previous in point.05 Lst out previous out point.06 start start of disk. (0 for abs controltimecode).07 end end of disk.08 reserved.09 reserved.Pressing the +/STORE button grabs thedisplayed timecode and allows it to bestored in one of the 100 locate memories.Use the number buttons to select amemory location and confirm the storagewith the green ENTER button.Note the timecode can be altered beforestorage using the ROTARY CONTROLKNOB.

29. STEREO HEADPHONE SOCKETHeadphone output connected to the outputof the digital monitor mixer.

30. HEADPHONE LEVEL CONTROLAdjust the output audio level to theheadphones.

31. POWER SWITCH

32. LOCATEPressing the LOCATE button oncedisplays a locate timecode in the loweralpha numeric display.You can alter the locate timecode usingthe ROTARY CONTROL KNOB, or theVALUE buttons. Additionally you can typethe timecode in using the NUMERICKEYPAD.If when using the keypad you type a ‘+’ or‘-‘ as the first character. Then the lowerdisplay timecode you type in is relative, asindicated by the ‘r’ in the right hand corner.Relative locates add the timecode in thelower display to the time code in the upperdisplay to produce a locate timecode.If you don’t type ‘+’ or ‘-‘ as the firstcharacter, the locate will be absolute asrepresented by the ‘a’ in the bottom rightcorner of the display. The Locate timecodewill be the timecode in the lower displaywith out reference to any other timecode.Pressing the green ENTER button willpark the GX8500 at the locate timecode.Pressing PLAY will play from the locatetimecode, providing that the time codeexists on the disk!

33. VALUE [r s ]In default timecode display mode the lefthand value button displays the currenttime remaining on disk. The right handbutton displays the current cue pointnumber. In other display modes theVALUE buttons alter data values relatingto parameters. The VALUE buttons autorepeat when held.

34. ENTERThe ENTER button stores and actionschanges made to the setup menu. It canalso be used to park the recorder duringlocate operations instead of the PLAYbutton. Pressing the button while a locatememory is displayed cues the recorder tothe selected timecode and stops.

35. PARAMETER [p q ]In the default timecode display mode theleft hand PARAMETER button displaysthe absolute timecode. The right handbutton displays the relative timecode. Seethe timecode section for an explanation ofthese terms. Pressing both PARAMETERbuttons simultaneously displays theexternal timecode. The rel led flashes to



indicate external timecode is beingdisplayed.In other display modes the PARAMETERbuttons select data for editing andconfirmation.

36. SETUPThis button accesses the setup menu forconfirmation or editing. See menu section.

37. OFFSETThis button allows the user to add atimecode offset to the incoming timecode.The led associated with the OFFSETbutton turns on when the offset is nonzero. The offset can be altered usingeither the ROTARY CONTROL KNOB orthe VALUE buttons. Pressing the buttontwice allows the user to monitor thedifference between an external incomingtimecode and the current 'off disk'timecode. The difference can be copied tothe offset value by pressing the greenENTER button.

38. ALPHA NUMERIC DISPLAYSThe front panel of the GX8500 containstwo, 8 character, led dot matrix,alphanumeric displays which showtimecode and setup information.

39. CHASEWhen the led associated with the CHASEbutton is on, and the GX8500 detects avalid external timecode that matches atimecode on the disk, the recorder goesinto play synchronous to the externaltimecode. Pressing STOP or CHASEcancels the chase operation.

40. ABS / REL TIMECODE INDICATORSThe ABS led indicates that the absolutetimecode is being displayed in the upperalpha numeric display.The REL led permanently on indicates thatrelative 'off disk' SMPTE timecode is beingdisplayed.See the timecode section for a descriptionof these terms.The REL led flashing indicates externaltimecode is being displayed excluding anyoffset.The timecode display shows --:--:--:--when external timecode is selected fordisplay and no timecode, or invalidtimecode is being received.

41. PPM DISPLAYThe PPM displays consists of eightcolumns of 20 segments each,representing channels 1 to 8 respectively.The meters are digital and are calibrated

in dBFS, with the top segmentrepresenting 0dBFS. Peak values can beset to decay immediately, be held for 2seconds before decaying, or can be helduntil the CLEAR PEAK HOLD button ispressed.Note the overload segments override allmenu settings and remain on until clearedby the pressing the CLEAR PEAK HOLDbutton.The row of tricolour led's at the base of thePPM represent signal present and mutestatus. If the unit detects digital data at theassociated rear panel input, and that datais electrically correct (in terms of eyepattern and signal strength) then the signalpresent LED's turn GREEN. If the signal atthe output is muted the LED's turnORANGE. If the signal at the output ismuted, but no signal exists at the input,the LED turns RED.

42. CLEAR PEAK HOLDThis button clears any peak values oroverload led's

43. EJECTThis button operates in stop only and isonly relevant to removable media such asMO disks.

44. ERASEThe ERASE button performs slightlydifferent functions depending on therecord mode.For linear record mode the erase functioncopies the existing directory into ascratchpad area on disk, and creates anew blank directory into the main andbackup directory areas on disk.No audio information is altered, theerase procedure simply removes thepointers to that information and theoperation is instantaneous.For non linear mode the erase functiongives the option of removing all projectsfrom disk.

45. GLOBAL MUTEThis button mutes all direct outputs.Signals fed to the internal monitor mix areunaffected.



46. STATUS LED’S

The front panel status LED's give a snapshotof the current status of the recorder. Thestatus is taken from the disk if a previouslyrecorded disk is inserted, or from the internalnvram otherwise

1. DISK LOADEDIf a disk has been correctly inserted or anon removable drive has been detectedthis LED will turn on.

2. BLANK DISKIf the unit detects no disk directory or if thedirectory is blank, this LED will turn on.The LED will turn off when you pressrecord.

3. INVALID DISKIf the unit cannot read the loaded disk,then this LED will turn on, and no furtherdisk operations are possible other thaneject.

4. DATA ERRORIf during playback or record the unitdetects a data error, this LED will turn onand remain on until the stop button ispressed. Because the LED remains on,you can only determine that there hasbeen one or more errors in the data, nothow many.The data error led can be cleared bypressing the clear peak hold button or thestop button. This allows the user to detectone off or continuous data errors.The data error led flashes to indicate ahardware error in the drive. If theerror is due to overheating the message'overtemp' will be displayed.

5. MASTER CLOCKIf you select master clock using the menu,this LED will turn on. The unit will thengenerate output clocks using it's internalcrystal oscillator.

6. SLAVE CLOCKIf you select any clock source but masterusing the menu, this LED will turn on. The

unit will generate output clocks phaselocked to the selected source. The LEDwill flash if the unit is unable to lock to theslave clock for any reason.

7. MASTER TIMECODEIndicates that the timecode generator isnot in genlock mode, or that genlock modeis being overridden.

8. SLAVE TIMECODEIndicates that the timecode generator is ingenlock mode.

9. 44.1KHzIf you select 44.1KHz as the outputsample rate from the menu, this LED willturn on.

10. 48.0KHzIf you select 48.0KHz as the outputsample rate from the menu, this LED willturn on.

11. SAMPLE RATE X 2If you have selected a sample rate of88.2KHz or 96KHz this led will be lit aswell as the 44.1KHz and 48Khz led’srespectively.

12. SAMPLE RATE X 4If you have selected a sample rate of176.4KHz or 192KHz this led will be lit aswell as the 44.1Khz and 48Khz led’srespectively.

13. 20 BITIf you select ‘20 bits in’ using the menuthen this LED will turn on.

14. 24 BITIf you select ‘24 bits in’ using the menuthen this LED will turn on.

DISK LOADED

INVALID DISK

DATA ERROR

MASTER CLOCK

SLAVE CLOCK

44.1KHz

48 KHzBLANK DISK

20 BIT

24 BIT

MASTER TIMECODE

SLAVE TIMECODE

SAMPLE RATE X 2

SAMPLE RATE X 4

GX8500 Operational manual Rev 1.0 Menu Operation

Genex Research Ltd 13

Menu Operation

Many of the functions of the GX8500 are set up using the menu systemaccessible from the front panel.

While the menu structure is being accessed the transport, chase, mute, ejectand ppm clear buttons are available as normal.

Displaying and Navigating the MenuPress the SETUP button to access the menu structure. The LED above theSETUP button turns on to show that the menu structure is being displayed.

Menu headings are shown in the upper alpha numeric display, parameters orvalues are shown in the lower display.

The GX8500 menu is three layers deep. The current menu level is indicatedby the sub menu indicator as shown in the diagram above. The top level ofthe menu is a selection of functional groups arranged in alphabetic order, novalues are available at this level.

Select a heading/group in the current menu level using the ROTARYCONTROL KNOB[P]

Changing Menu Levels

To move up and down menu levels use the PARAMETER up [p ] and downbuttons. One of the available submenu headings will now be displayed in theupper alpha numeric display.

To display alternative headings at this menu level, rotate the Jog wheel [P].

If you are not at the top level, the lower display will show one of the availablevalues.

P Mixer p$

P Pan CTRr s

0-1dB-2dB-3dB-4dB-5dB-6dB

P Mixer p$

P Pan CTRr s


SUBMENU

VALUE

SUBMENUINDICATOR

= Submenu

= Sub-submenu

Pan 3dB

- 5 d B

GX8500 Operational manual Rev 1.0 Menu Operation


Changing the Value of a Menu Option

To select each of the available values for a chosen sub-menu heading usethe VALUE [r s ] buttons. With each press of the r button, the valuedisplayed in the lower LED display will change to the next available value.Pressing the s button moves back to the previous value

For some menu headings you can enter values using the numeric keypad.

Press the green ENTER button to store the information displayed. The lowerLED display will momentarily indicate 'STORED' if the operation wascompleted successfully.

In certain modes, some values can not be altered. In this case a message willbe momentarily displayed.

GX8500 Operational manual Rev 1.0 Projects and Presets


Projects and Presets

What is a Project?

Projects form the basis of the GX8500 file handling system. A project alwayscontains one or more audio files, a machine setup file and a playlist. Projectsare stored on disk and up to 199 projects can exist on one partition or disksurface. The machine setup file contains a “snapshot” of the entire machinestate including the menu structure prior to the project being saved. Thisenables the user to create custom set ups for use in different recordingenvironments and also store important events such as cue points, pan andgain adjustments and basic editing functions such as individual track slips orglobal offsets. This information can be recalled at a later date and updated orcopied to a new project for post recording adjustments to be made.

What is a Preset?Presets are identical to the machine setup file from a project but they arestored in non volatile memory inside the GX8500. Up to 9 presets can bestored. The currently open preset (indicated by a flashing display in the recallmenu) is opened automatically when the machine is powered off and onagain.

Projects and presets can both be renamed.

Opening a project overwrites the preset settings but not the preset itself. Youcan save the machine setup part of a project as a preset by opening theproject and selecting save preset.

Opening a preset overwrites the machine setup part of a project. The projecton disk remains the same however until the project is resaved.

Project Management

New project

To create a new project, select Projects > New from the “SETUP”menu

You will then be presented with the next available default project title,“newprjxx” where “xx” will be a number. Press ENTER to create it, you willthen be asked whether you wish to save your old project, use the Value keysto select yes or no, then press enter.

Open project

To open a saved project select Projects > Open from the “SETUP”menu

Use the Value keys to cycle through the available projects on the currentdisk, where “nnn” is the project number, then press ENTER to select it.

The GX8500 will now be set up exactly as when the project was created.

If there are no projects to open, the message “No Files” will be displayed inthe lower display.

P Projects p$

POpenr s

“Proj.nnn”

P Projects p$

PNewr s

“newprjxx”



Save as Project

To save the current project select Projects > Save As from the setupmenu.

Use the value buttons to choose a name for your set up. The names of allprojects on disk are displayed starting with the name of the currently openproject. You can enter a different name if required by selecting charactermode.

Character ModeTo edit any preset or project name, press both VALUE buttonssimultaneously.

A flashing underscore will appear which can be positioned using the VALUEbuttons. Use the JOG WHEEL to scan through the ASCII character until thedesired charcter is found. Alter each character as required.

Press the ENTER button to store the new name when finished or press bothVALUE keys again to reset the name to its original value. Exiting the currentmenu heading will also exit character mode and reset the name to theprevious value.

Delete Project

To delete a project select Projects > Delete from the setup menu.

Select the required filename using the “value” buttons, then press enter todelete it.

Presets can not be deleted. Once removed a project can not be recovered.

Rename Project

To rename a project select Projects > Rename from the setup menu.

Press both “Value” buttons simultaneously to enter character mode, thecursor should appear in the lower display. Use the jog wheel to select acharacter and the value keys to move along the project name. When youhave finished press the green enter button to store the changes.

P Projects p$

P Save Asr s

“Proj.nnn”

P Projects p$

P Deleter s

“Project name”

P Projects p$

P Rename

“Project name”



BackupBackup can be used to backup and restore projects or whole disks to otherSCSI devices including tape streaming cartridges. There is also an option ofmaking an identical clone of one disk/drive to another.

When Backup is first selected, the lower display shows ScanBus? Thisprompts you to enter Backup mode by rescanning the SCSI bus for availablestorage devices. If more than one device is available the Backup procedurefollows the following sequence,

1. Prompt for source SCSI ID. Use the VALUE buttons to select one of theavailable SCSI devices and press the ENTER button to confirm,

2. Prompts for projects to copy from the source SCSI ID or whether to clonethe entire disk. The cloning process makes an identical digital copy. Usethe VALUE buttons to display the project to be copied and press the+/STORE button to add the project to the copy list. Each project alreadyadded to the copy list has an exclamation mark in the left hand characterposition of the upper display. Press the ENTER button when you haveselected all required projects.

3. Prompt for destination SCSI ID. Use the VALUE buttons to select one ofthe remaining SCSI devices and press the ENTER button to confirm,

If you wish to clone a disk, just use the VALUE buttons to go tothe clone value and press ENTER. For Genex format disks cloneis the only option available.

Scanbus?

P Projects p$

P Backup pr s

Scanbus?<enter>

r s Scr ID:x ! :<enter>

r s Source$

Projects Clone Go back<$ <enter>

<+/store><enter>

r s DestID:x<enter>



4. The number of Mbytes to be copied is displayed in the lower display,alternating with the number of disks or drives required at the destinationID. Press the green ENTER button to start the copy.

5. The time remaining is displayed in the lower display during the copy orclone process.

6. On completion the display returns to BACKUP > SCANBUS?

Auto Save

To set Autosave, select Projects > AutoSav from the setup menu.

When auto save is on, the current project is saved to disk approximatelyevery 30 seconds.

P Projects p$

P AutoSavr sOnOff

At each stage of the backup procedure a go back option is available toallow you to step back and change previously entered values.



PresetsThere are 9 spaces for preset set ups (“Preset 1”-“Preset 9”) which can bealtered by the user if required. Presets are stored in non volatile memory, andwill therefore not be erased once the machine has been switched off.

Save Preset

To save a preset, select Projects from the setup menu, then selectPresets, using the JOG WHEEL select Save.

To change the name of the preset, press both “Value” buttonssimultaneously, a flashing cursor will appear in the lower display. Use the jogwheel to select an ascii character and the value keys to move along theproject name. When you have finished press the green enter button to storethe changes.

Recall Preset

To recall a saved preset, select Projects from the setup menu, thenselect Presets, using the JOG WHEEL select Recall.

Use the value up button to select the required preset then press the greenenter button.

Project DataA project can store other information relating to the current session e.g. Artist,Client, Location, date and time etc.

From the Projects menu select PrjData then use the JOG WHEELto view the Project Data headings.

The heading are as follows:

Artist – Name or title of the recording subject

Client – Name or title of the client

Cr.Date – The date on which the project was last updated

Cr.Time – The time at which the project was last updated

Engin’r – Name of the lead Engineer

Job # - The job number

Locat’n – Where the recording took place

Prod’cr – Name of the Producer

Side # - The side number of the disk in this recording

Work – Name or title of this recording session.

Date - GX8500 internal clock

Time - GX8500 internal clock

P Projects p$

P Presetsp qP

Save$

“preset 1-9”

P Projects p$

P Presetsp qP

Recall$

“preset 1-9”



By default these fields are all blank, except Date and Time, and all can beedited by using the JOG WHEEL and VALUE buttons. Editing can also becarried out using the GXR Remote Software distributed with your machine(refer to the section on Remote Software).

DateThis field displays the current date in DD|MM|YY ( Day|Month|Year ) format.

TimeThis field displays the current time in HH:MM:SS (Hours:Minutes:Seconds)format.

To edit information in the date and time fields, press both VALUE keys downtogether at the same time.

You will see a flashing underscore which can be positioned using the VALUEbuttons. Use the JOG WHEEL to adjust the date or time value.

Press the ENTER button to confirm the change or press both VALUE buttonsagain to reset the field to its original value.

P Project p

$P Prj Data p q

P P P P P P P P P PArtist Client Cr.Date Cr.Time Engin’r Job# Locat’n Prod’cr Side# Work$ $ $ $ $ $ $ $ $ $

xxxxxxx xxxxxxx yymmdd hhmmss xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx nn xxxxxxxx

P Projects p$

P PrjDatap qP

Date$

dd/mm/yy

P Projects p$

P PrjDatap qP

Time$

hh/mm/ss

GX8500 Operational manual Rev 1.0 Audio


Audio

Audio FormatsThis section describes how to configure the input/output section of theGX8500.

The following parameters can be adjusted;

Input FormatAES,

SDIF2,

DSD (Direct Stream Digital), or

ANALOGUE (The GX8500 can be fitted with optional 8 channel 24bit/96kHz ADC and/orDAC).

Input ConfigurationYou can select single wire, dual wire or quad wire. The setting refers to theposition of consecutive samples within an audio carrier. Leave this set tosingle wire if you are unsure.

In single wire mode each consecutive audio sample for a given track islocated within that track. For the AES format this means that one AES cablecan carry two tracks of information.

Dual wire mode means that each consecutive audio sample is contained inadjacent tracks. For the AES format this means that one AES cable can carryonly one track of information.

Quad wire mode means that successive audio samples rotate through fouradjacent tracks. For the AES format this means that two AES cables carryone track of information.

There are restrictions in the use of the input configuration menu heading asthe settings can affect adjacent tracks. The table below shows thepossibilities for linear recording modes.

It is tempting to think that the input configuration is related to sample rate,however the setting only determines what order samples are read from theinput tracks and what order they are written to the output tracks. For exampleyou can choose single or dual wire 48kHz and 96kHz operation, but due tohardware restrictions you cannot select single wire 192kHz operation. If youattempt to do so the 8500 will select the next lowest sample rate available.

Digital and analogue outputs are active at the same time, however onlyone digital format can be active at a time. The desired output formatmust be selected using the I/O Fmt menu heading



SAMPLE RATEInputconfiguration

available 44.1kHz 48kHz 88.2kHz 96kHz 176.4kHz 192kHz

1 TrackSingleDualQuad

SingleDualQuad

SingleDualQuad

SingleDualQuad

DualQuad

DualQuad

2 TracksSingleDualQuad

SingleDualQuad

SingleDualQuad

SingleDualQuad

DualQuad

DualQuad

3 Tracks SingleDual

SingleDual

SingleDual

SingleDual Dual Dual

4 Tracks SingleDual

SingleDual

SingleDual


5 Tracks Single Single Single Single



NU

MB

ER

OF R

EC

OR

D TR

AC

KS


Bits InThis setting combined with the disk format setting determines how theincoming digital audio is packed onto a disk. Available choices are 16, 20 and24. No dither is added if the input audio bit depth is greater than thatselected, the audio is simply truncated which will result in quantisationdistortion.

Because of the potential for data corruption, the GX8500 has a way ofdisplaying the input bit activity on the PPM’s. Press and hold the track controlbutton for the track on which you want to monitor the bit activity. After a shortdelay the lower 20 bits of the incoming audio sample will be displayed on theassociated PPM with the LSB at the bottom. The display will remain for aslong as you hold the track control button down. If all 20 bits of the PPM aretoggling then the incoming bit depth is 24 bits so set the bits in to 24 bits forthat channel. If the bottom 4 bits of the display are off, then the incoming bitdepth is 20 bits. If the bottom 8 bits of the display are off then the incoming bitdepth is 16 bits.

Bits Out and DitherThis setting truncates the output audio to the selected number of bits. Nodither is added automatically. Dither should be applied if the selected ‘bitsout’ is less than the input or off disk bit depth.

Note that the truncation occurs in the output buffer and so affects data routedfrom the input as well as off disk data.

Available choices of bit depth are 16, 20 and 24.

Two types of dither noise are available,

1. Triangular PDF dither adds 6dB to the noise floor and should be used iffurther processing is required to the audio once it has been transferredfrom the unit.

2. Noise shaped dither adds more noise at higher frequencies where the earis less sensitive. This type of noise masks the quantisation noiseproduced by truncation but also has an apparently lower noise floor than



triangular PDF dither. Noise shaped dither should only be added at thefinal stage of the production process.

Global Source setup

Changes made here apply to all 8 input audio sources simultaneously. Selectthe AUDIO parameter from the “SETUP” menu. Select “GLOBAL” subheading then the required parameter.

P Audio p$

P Global pP

Inp Fmt Inp Cfg Bits In BitsOut Ditherr s r s r s r s r sAES Single 16 16 None

SDIF2 Dual 20 20 TriangleDSD Quad 24 24 Shaped

Analogue



Audio Routing

The GX8500 has extensive internal signal routing capabilities. A digital SINEWAVE generator is also included for internal and external calibration and

testing.

Input Routing

Any one of the eight input channels can be routed to any one of the TRACKSin the GX8500. In addition, the left and right outputs of the mixer can berouted back to any track allowing you to “BOUNCE” tracks. It is also possibleto route an internal digital sine wave to any, or all of the tra

To select the source for a particular track, select “ROUTING” from the“SETUP “menu and the “INPUT” subheading. Then select a track with theJOG wheel. The “value” buttons will cycle through the available input sourcesfor that track.

Don’t forget topress ENTERafter makingyour choice

AUDIOROUTINGMATRIX

INPUT SOURCESINTERNAL

MIXERL+R

SINE WAVEGENERATOR

OUTPUTS

SCSI DRIVE



Disk Routing

It is possible to route any recorded track to any output by selecting“ROUTING > DISK” from the “SETUP” menu. Then using the JOG wheel,select which Track you want to route and the VALUE buttons to select theoutput track. Press ENTER to confirm your selection.

P Routing p$

P Input pP

Track 1 Track 2 Track 3 Track 4 Track 5 Track 6 Track 7 Track 8 C’brater s r s r s r s r s r s r s r s r s

Input 1 Input 1 Input 1 Input 1 Input 1 Input 1 Input 1 Input 1 NormalInput 2 Input 2 Input 2 Input 2 Input 2 Input 2 Input 2 Input 2 Sine AllInput 3 Input 3 Input 3 Input 3 Input 3 Input 3 Input 3 Input 3Input 4 Input 4 Input 4 Input 4 Input 4 Input 4 Input 4 Input 4Input 5 Input 5 Input 5 Input 5 Input 5 Input 5 Input 5 Input 5Input 6 Input 6 Input 6 Input 6 Input 6 Input 6 Input 6 Input 6Input 7 Input 7 Input 7 Input 7 Input 7 Input 7 Input 7 Input 7Input 8 Input 8 Input 8 Input 8 Input 8 Input 8 Input 8 Input 8

Mix Out L Mix Out L Mix Out L Mix Out L Mix Out L Mix Out L Mix Out L Mix Out LMix Out R Mix Out R Mix Out R Mix Out R Mix Out R Mix Out R Mix Out R Mix Out RSine Gen Sine Gen Sine Gen Sine Gen Sine Gen Sine Gen Sine Gen Sine Gen

P Routing p$

P Disk pP P P P P P P P

Track 1 Track 2 Track 3 Track 4 Track 5 Track 6 Track 7 Track 8r s r s r s r s r s r s r s r s

Track 1 Track 1 Track 1 Track 1 Track 1 Track 1 Track 1 Track 1Track 2 Track 2 Track 2 Track 2 Track 2 Track 2 Track 2 Track 2Track 3 Track 3 Track 3 Track 3 Track 3 Track 3 Track 3 Track 3Track 4 Track 4 Track 4 Track 4 Track 4 Track 4 Track 4 Track 4Track 5 Track 5 Track 5 Track 5 Track 5 Track 5 Track 5 Track 5Track 6 Track 6 Track 6 Track 6 Track 6 Track 6 Track 6 Track 6Track 7 Track 7 Track 7 Track 7 Track 7 Track 7 Track 7 Track 7Track 8 Track 8 Track 8 Track 8 Track 8 Track 8 Track 8 Track 8

GX8500 Operational manual Rev 1.0 Digital Clocks


Digital Clocks

Clock Source

When transferring digital data from an external source to the GX8500, it isessential to lock the GX8500 to the incoming audio data. The two mostcommon solutions are,

1. Lock the GX8500 to the incoming AES audio data.

2. Lock both the source of the audio and the GX8500 to an external clock orvideo syncs. In this way both source and destination have a commonclock source.

Use the clock setup menu to select the clock source for the GX8500.

Clock (Sample) Rate

It is also necessary to match the clock rate of the GX8500 to the incomingclock rate. Use the sample rate menu heading in the setup menu.

If the GX8500 is locked to any AES data source or to an external clock, Anydiscrepancy between the external sample rate and the selected sample ratewill flash the SLAVE CLOCK led on the front panel.

If the GX8500 is set to generate clocks, or is locked to composite videosyncs, the sample rate heading will adjust the output sample rate, and alsothe playback rate of the audio on disk. For example, if the original recordingwas sampled at 48kHz, setting the sample rate to 44.1kHz will result in theaudio playing back at a lower pitch.

When a non blank disk is loaded, or a new project is opened, the outputsample rate is automatically switched to match the sample rate on the disk.You can then select any sample rate for playback but the 'Smpl Rte' headingwill flash to indicate that the selected sample rate does not match the disksample rate.

P Clocks p$

P Clk Src pr s

MasterInp 1+2Inp 3+4Inp 5+6Inp 7+8Ext Clk

Comp VidMix Inp

P Clocks p$

P SmplRte pr s

32000Hz44100Hz48000Hz88200Hz96000Hz

176400Hz192000Hz

Master refers to the GX8500 generating clocks using it's own internalclock source. This setting should normally only be used for playback.

The ‘Mix Inp' selection refers to digital audio connected to the monitormix input on the rear panel of the GX8500. The monitor mix input islabelled “AES/EBU MONITOR MIX”

GX8500 Operational manual Rev 1.0 Digital Clocks


Clock (Sample Rate) ModifiersThese settings allow you to adjust the nominal sample rate by a fixed ratio.

The ratio 1.000 has no effect on the selected sample rate.

The ratios 1.001and 0.999 would be used to compensate for 29.97 to 30Ftimecode transfers.

Note that this setting adjusts the word clock output at the rear of the GX8500.For example, with a sample rate of 48000Hz, selecting 0.999 would result ina 47952Hz word clock at the output.

P Clocks p$

P Modify pr s

X 1.000X 1.001X 0.999X 24/25X 25/24

GX8500 Operational manual Rev 1.0 Playback


Playback

Audio PlaybackCheck that the disk loaded led is on, and that the blank led is off.

Configure the audio output section as described in the Audio section of themanual.

Open a project if the disk format supports projects.

Locate to the required timecode using any of the techniques described laterin this section.

Make sure that the INPUT ALL and AUTO INPUT buttons are off andconfigure the monitor mixer if listening through headphones or to the digitalmixer output.

Press the PLAY button to start playback.

The PPM’s will display any audio activity and you can adjust the peak holdand overload leds as described in the Display section later in the manual.

Press the STOP button to discontinue playback.

Repeat Playback 1. The REPEAT button allows you to constantly play or loop between

previously entered in and out points. The procedure for entering in and outpoints is described in the Record section of the manual.No Preroll or Postroll times are added to the start and end points of theloop.If the out point timecode is less than the input timecode, playback willcontinue until the end of the timeline

2. Press the REPEAT button. The 'repeat' message appears in the loweralpha numeric display.

3. Press PLAY to begin the loop. The loop will continue for as long as the'repeat' message is displayed.

4. Press the REPEAT button again to cancel the loop.The loop can be paused at any time by pressing STOP.

Digital and analogue outputs are active at the same time, however only onedigital format can be active at a time. The desired output format must beselected using the I/O Fmt menu heading.



Spool Track PreferencesUse this heading to determine which track is given priority when playing backat “greater than real time”.

Depending on the speed of the drive and the spool rate, it may not bepossible to hear audio from all channels simultaneously. Channels aredropped one at a time. i.e. if the spool track is 3, channels are muted in heorder of 2, 1, 8, 7, 6, 5 then 4

If the spool track is 1 then channels are muted in the following order:-

8, 7, 6, 5, 4, 3, 2

NOTE: in extreme cases, all channels will be muted.

i.e. 8 channels @ 24bits, 96kHz from a slow drive

P Playback p$

P Sp'lTrkr s

Track 1Track 2Track 3Track 4Track 5Track 6Track 7Track 8



Using Headphones

Setting up the Internal Monitor Mixer

An internal 8 into 2, 24 bit, 96kHz digital mixer feeds the headphone outputand is sent as a digital signal to the rear of the unit. The mix output isavailable in an AES format on an XLR connector.

Adding Tracks into the mixPressing the MIX button displays tracks that are currently added to the mixbus on the green led's above the track control buttons. Use the TRACKCONTROL buttons to add or subtract signals to or from the internal digitalmonitor mix. Pressing the MIX button also displays fader and pan settings inthe alpha numeric displays.To alter the these settings, select a channel using the PARAMETER buttons.Use the ROTARY CONTROL KNOB to adjust the gain of the channel, andthe VALUE buttons to alter the pan setting. The pan varies between full leftrepresented by 'l', centre, represented by '[]', and full right represented by 'r'.

Mixer phase invertThe -/CLEAR and +/STORE buttons on the numeric keypad can be used tophase invert the selected channel. Phase inversion is represented by the

phase symbol ”Φ ” before the gain setting.



MixerAll the settings under the “Mixer” heading only affect the monitor mix output.The main outputs 1-8 are not affected by these settings.

Pan Centre DepthThis setting allows you to adjust the gain at the central pan position between0 and –6dB

Set the Monitor Mixer Bits per SampleThe monitor mixer output can be set to values from 8 bits to 24 bits persample, separate from the main outputs. This feature allows the user to copyto a lower resolution media such as DAT while the main outputs remain athigh resolution.

Applying Dither to the Monitor Mix OutputDither can be applied to the mixer output if the mixer bit depth is less than therecording on disk. The settings can be found in the mixer setup menus. Thissetting does not effect the main outputs.

P Mixer p$

P Bits Outr s

810121415161718192021222324

P Mixer p$

P Ditherr sNone

TriangleShaped

P Mixer p$

P Pan ctrr s




Track Slipping

You can delay or advance individual tracks in units of samples, 1/10 frame,perforations, frames, or seconds. One sample is equivalent to a delay of1/(sample rate) microseconds.

Selecting the track slip units

1. Press and hold the SLIP button until the Slip Inc menu appears.

2. Continue to hold the SLIP button down and use the jog wheel [P] toadjust the track slip basic unit.

3. When the desired unit has been chosen, release the SLIP button.

4. The chosen unit should be abbreviated on the right hand side of the lowerdisplay. (s for samples, tf for 1/10 frames, pf for perforations, fr for framesand sc is for seconds).

Performing track slip

1. Press the SLIP button until the Track Slip menu appears.

All tracks can be adjusted simultaneously by pressing the +/STOREbutton until the letter 'j' (join) appears to the left of the lower alpha numericdisplay. While 'j is displayed, track slip operations are applied to all tracks.

2. Use the PARAMETER buttons to select the track to advance or delay.

3. Use either the VALUE buttons or the rotary control knob to adjust thedelay.

T 1 s l i p

+ 0 0 0 0 0 s



Note the delay can be adjusted while the GX8500 is in play or stop.

4. Press the SLIP button again to return the GX8500 to the default timecodedisplay.

Selectable track slip incrementsHold down the track slip button, a selection of increments becomes available,samples, tenth frame, perforations and frames. While continuing to hold downthe track slip button use the jog wheel to select the required increment. Whenthe button is released the selected increment becomes the basic unit for thetrack slip.Individual tracks can be slipped backwards as well as forwards.

Locating

Locating Using TimecodesPressing the LOCATE button once displays a locate timecode in the loweralpha-numeric display.

You can alter the locate timecode using the jog wheel, or the VALUE buttons.Additionally you can type the timecode in using the numeric keypad.

If when using the keypad you type a ‘+’ or ‘-‘ as the first character. Then thelower display timecode you type in is relative, as indicated by the ‘r’ in theright hand corner. Relative locates add the timecode in the lower display tothe time code in the upper display to produce a locate timecode

If you don’t type ‘+’ or ‘-‘ as the first character, the locate will be absolute asrepresented by the ‘a’ in the bottom right corner of the display. The Locatetimecode will be the timecode in the lower display with out reference to anyother timecode.

Pressing the green ENTER button will park the GX8500 at the locatetimecode. Pressing PLAY will play from the locate timecode, providing thatthe time code exists on the disk!

Locating Using Cue PointsPressing the locate button twice displays a cue point in the lower display, Ifthere are no cue points on the disk, the message ‘no cues’ is displayed.

You can cycle through the available cue points using the ROTARYCONTROL KNOB or the VALUE buttons. The timecode corresponding to thecue point is displayed in the upper display.

Pressing the green ENTER button will park the GX8500 at the locatetimecode. Pressing PLAY will play from the locate timecode, providing thatthe time code exists on the disk!

Locate MemoriesThe numeric keypad allows access to the timecode locate memories.Pressing number buttons while the recorder is in basic timecode displaymode recalls one of the 100 locate memories. The recalled timecode isdisplayed in the alpha numeric display. Pressing play while this timecode isdisplayed plays from the recalled timecode and returns the display to defaulttimecodeThe first 10 locate memories are pre defined and are not alterable. Theseare,00 Lst rec last record point.01 Lst ply last play point.02 Lst stp last stop point.



03 Lst loc last locate point.04 Last In previous in point.05 LstOut previous out point.06 Start start of disk. (0 for abs control timecode).07 End end of disk.08 loop1 reserved.09 loop2 reserved.Pressing the +/STORE button grabs the displayed timecode and allows it tobe stored in one of the 100 locate memories. Use the number buttons toselect a memory location and confirm the storage with the green ENTERbutton.Note the timecode can be altered before storage using the rotary controlknob

+/- 10 Secs ButtonsThese buttons locates to a point 10 seconds before or 10 seconds after thecurrent timecode. If the recorder is in play when the button is pressed,playback continues at the new timecode, otherwise the recorder is parked atthe new timecode

Previous / Next ButtonsThese buttons locates to the previous or next cue point.If the recorder was in play when the button was pressed, playback continuesat the new timecode, otherwise the recorder is parked at the new timecode.The button auto repeats if held and will continue to select previous or nextcue points until released.The types of cue point located by this button are set in the 'Ref Cue' menuheading. For example, if 'Ref Cue' is set to take, pressing the PREVIOUSbutton steps through every take point on disk.

The PREVIOUS and NEXT buttons can also be used to locate audio clips innon linear record mode. Set the ‘Ref Cue’ menu heading to Music. ThePREVIOUS and NEXT buttons will step through each clip within the currentlyopen project.

Adjusting Locate Memories Using the Scrub WheelYou can audibly trim the time code reference points using the Jog/Scrubfunction on the GX8500. This is useful when it is necessary to accurately trima point to a particular attack or phrase in the audio. Timecode referencepoints cover all memory locations that reference a particular moment of audioto timecode. These are:-

In points

Out points

Locate memories

Cue points.

For example, to audibly adjust the In point,

1. Recall the current In point (Press the IN button with the machine in stop)

2. Press the JOG button so that the jog led is on.



3. Use the ROTARY CONTROL KNOB to adjust the new point

4. Press the green ENTER button to transfer the current timecode to the inpoint timecode.

GX8500 Operational manual Rev 1.0 Recording


Recording

Media Formats

Disk FormatThis displays the disk format of the currently selected disk or drive. The menuheading is read only and cannot be altered.

File FormatThis displays the file format of the currently selected disk or drive. The menuheading is read only and cannot be altered.

Format Disk/Drive

There are two methods of formatting a disk or drive.

1. Format is a quick format that creates a partition equal to the size of thedrive or disk and creates a boot sector and FAT at the start of thepartition. The process takes a few seconds to complete.

2. Certify is the same as format above but in addition, writes to every sectoron the disk or drive and reallocates bad sectors. The process can take 15minutes to several hours depending on the size of the media.

P Format p$

P DiskFmtr s

GenexFAT32UDFHFS+

P Format p$

P FileFmtr s

GenexBWFAIFF

P Format p$

P Format pP P

Format Certifyr s r s

Genex GenexUDF UDF



Audio Recording

Recording ModeThe GX8500 has four recording modes, ASSEMBLE, INSERT, NON-LINEARand PACKED NON-LINEAR. The four parameters are accessible from withinthe setup menu, RECORD > REC MOD.

Linear and Non Linear recordingLinear recording modes are analogous to traditional tape recording. Allrecording, whether initial recording or an overdub is destructive; existingaudio is overwritten. The number of tracks available is determined when thedisk is formatted and cannot be altered subsequently. The availablerecording time depends on the selected number of tracks, the input bit depth,and the sample rate.

Non linear recording is non destructive. Each new recording takes up diskspace and a playlist references the audio for playback. The tracks menuheading in this mode is redundant and defaults to 8. Non linear recordingmakes basic cut, copy and paste editing available together with resequencingof audio files.

Linear Modes

AssembleIt is impossible to overwrite existing audio in this mode. New recordingscommence at the end of the last recorded segment (the segment with thehighest abs timecode), regardless of the current timecode. This means thatyou can review audio at any point on the disk safe in the knowledge thatpressing record will not erase existing content.

Assemble mode would mainly be used for location / live recording andmastering

InsertRecording commences at the current abs timecode. You will need to cue orplay to the desired location before pressing RECORD.

Insert mode is used where overdubbing is required.

[WARNING] It is possible to overwrite existing audio in this mode!!!

Insert and Assemble modes can be mixed on the side of a disk or withina project. There is no indication of which mode you are in other than thesetup menu. The GXR48 P2 remote controller provides visible recordmode indicators if this restriction proves problematic.

P Record p$

P Rec Modr s

AssembleInsert

Non linPack NL



Non Linear Modes

Non LinearWhereas in linear recording there is a fixed relationship between the physicalposition of the audio on disk and the timecode, in non linear mode there is nosuch link. Audio can be recorded at any point along a 24 hour timelineregardless of the previously recorded audio content. A playlist points to theaudio files within a project, and the actions of cutting, copying and pastingmodify the playlist, not the audio. It is therefore possible to undo and redoprevious recordings or edits. 99 undo levels are available.

Packed Non LinearThis mode is identical to Non Linear above, except that the audio files arecompacted to maximise disk space. The compaction process is lossless andeach regenerated playback sample is identical to the original recording. Thedisadvantage is that the available time cannot be predicted accurately as itdepends on the musical content. The GX8500 time remaining indicator isquite intelligent however, and, providing the musical content remains similarthroughout the extent of a disk, can be quite accurate.

Dynamic music content such as classical music compacts quite well, a solopiano for example can achieve 3:1 to 4:1 compaction ratios. Violins howeverwhich generate higher frequencies do not perform as well. Pop music whichis very compressed, i.e. has a very low dynamic range, performs worst of all,and can sometimes struggle to achieve 1.5:1 compaction. Note that it is notpossible to compact random or white noise to any degree.



Making Initial RecordingsCheck that the disk loaded led is on.

Either

Format the disk/drive as described at the start of this section.

Or

If the disk/drive is already formatted, press the blue ERASE disk button andconfirm the operation with the green ENTER button. For the Genex formaterasing and quick formatting a disk/drive are identical procedures

Use the setup menu to select the number of bits in, the timecode frame rate,and the sample rateThe bits in value is selectable between 16, 20, and 24. The number of bits isselected by using the VALUE buttons.

If recording in Linear mode, press the TC ARM button to arm the timecodetrack.

Configure the Audio I/O as described in the Audio section.Select the tracks to be recorded by pressing REC ENABLE followed by theassociated RECORD ENABLE button. The record enable led will flash.

Hold RECORD and press PLAY for recording to start.

Use the PARAMETER buttons to display either the ABS control tracktimecode, or the REL SMPTE timecode.

Press STOP or PLAY to drop out of record.

MO disks are double sided, but there is only one laser in the MO drive.Each side can only be accessed by manually turning the disk over

Each disk side has its own write protect tab. Make sure the tab is closedbefore trying to record on the disk. The GX8500 will warn you if a writeprotected disk is inserted.

These parameters are fixed for the duration of the disk or projectdepending on the disk format and/or record mode. For linear recordmodes the number of tracks and bits in can only be altered with either nodisk or a blank disk inserted

Genex Disk Format OnlyYou will be prompted to set the number record tracks after erasing thedisk.This action formats the disk for the number of tracks required and adjuststhe time remaining accordingly.The number of tracks is adjustable between 1 and 8, but can only beupdated when no disk or a blank disk is loaded. The number of trackswhen combined with the bits per sample and the sample rate determineshow much time is available per channel on the side of a disk.If less than 8 tracks are selected, channels become unavailable from thehighest number down. For example, if 5 channel recording is selected,channels 1 to 5 are available for recording, and channels 6 to 8 areunavailable.



Make the recorded tracks safe by pressing the active RECORD ENABLEbuttons again.

Number of TracksThis setting is relevant for linear recording modes only. For non linear modesthe number of tracks defaults to 8.

The setting determines how many tracks are to be recorded on the currentdisk side.

The number is adjustable between 1 and 8, but can only be updated when nodisk or a blank disk is loaded. The number of tracks when combined with thebits per sample and the sample rate determines how much time is availableper channel on the side of a disk

Track Arm in RecordThis setting determines how the track arm buttons function when in record.

1. PUNCH INWhen selected and the GX8500 is in record, the track arm buttons allowyou to “Punch in” on any track by simply pressing the appropriate trackarm button, the record enable led for that track will light to confirm thatthat track is now recording.Pressing the same track arm button again will “Punch out” the selectedtrack. The record enable led will go off.

2. ARMWhen selected, the track arm buttons only arm tracks regardless of themode of the machine this is done by pressing the record enable buttonand then the track arm buttons of the tracks you wish to record on. Therecord enable leds will flash to show which tracks are armed.

P Record p$

P Tracksr s1-8

P Record p$

P Trk Armr s

Punch inArm

RECORDENABLE LEDS

TRACK ARMBUTTONS



Punch In Recording

Setting In and Out points using the IN and OUT buttons

1. Play back from a point before the point where you want to drop intorecord.

2. At the point where you want to drop into record, press the IN button. Thecaptured In point timecode will be displayed in the alpha numeric display.

3. At the point where you want to drop out of record, press the OUT button.The captured Out point timecode will be displayed in the alpha numericdisplay.

4. Press STOP to halt the playback.

5. Press the IN or OUT button to recall the previously entered timecodes.

Setting In and Out points using the REHEARSE button.

1. Use the TRACK ARM buttons to arm the tracks you want to drop intorecord. The corresponding record enable led's will flash.

2. Play back from a point before the point where you want to drop intorecord.

3. At the point where you want to drop into record, press the REHEARSEbutton. The captured In point timecode will be displayed in the alphanumeric display, and the monitoring will switch to input on the recordarmed tracks.

4. At the point where you want to drop out of record, press the REHEARSEbutton again. The captured Out point timecode will be displayed in thealpha numeric display. and the monitoring will switch back to off disk forthe record armed tracks.



5. Press STOP to halt the playback.

Adjusting the In or Out Points

1. Check that the GX8500 is stopped.

2. Press the IN or OUT button to recall the previously entered timecodes.

3. Adjust the timecode using the rotary control knob, or press the JOGbutton to adjust the point using an audible scrub.

4. Use the rotary control knob to adjust the audio to the new point.

5. Press the green enter button to transfer the current timecode to the in orout point timecode.

Rehearsal

1. Use the menu to set the preroll and postroll times. The GX8500 plays fromthe In point minus the Preroll timecode, and plays to the Out point plus thePostroll timecode.

2. Put the punch in tracks to record ready by pressing the associated recordenable button.

3. Press the REHEARSAL button. When the In point is reached the recordenable led's will stay lit and monitoring will switch to the input on therecord readied tracks, but the GX8500 will not go into record. When theOut point is reached, the record ready led's will once again flash,monitoring will switch back to the disk on all tracks, and the GX8500 willcontinue to play for the post roll period.

4. The rehearsal can be repeated manually as often as is necessary bypressing the REHEARSE button, or automatically by pressing theREPEAT button until the message 'repeat' is displayed.The rehearsal can be halted at any time by pressing the STOP button.

If the Out point timecode is less than the In point timecode, the GX8500will continue playing until the end of the current partition or disk.

Auto Punch In

1. Enter In and Out points as previously described.


3. Press the AUTO IN/OUT button. The associated led turns on.

4. If recording in a linear mode, press the TIMECODE RECORD ENABLEbutton on or off. For non linear modes every sound clip is marked with astart timecode regardless of the state of the TIMECODE RECORDENABLE button.

5. Press PLAY. The GX8500 will start playing from the In point minus thePreroll timecode. When the In point is reached the GX8500 will go intorecord. When the Out point is reached, the GX8500 will switch to play andcontinue for the post roll period.

Pressing the In or Out buttons during play stores a new timecode. Toalter an existing timecode, the GX8500 must be in STOP



6. Repeat the punch in by pressing the PLAY button. The punch can berepeated indefinitely by pressing the REPEAT button before pressing thePLAY button.

7. The process can be halted at any time by pressing the STOP button.

8. Exit Auto punch mode by pressing the AUTO IN/OUT button again.If the Out point timecode is less than the In point timecode, the GX8500will continue playing until the end of the current partition or disk.

Manual Punch In and Out

1. Locate to a point a few seconds before the expected punch in point.


3. If recording in a linear mode, press the TIMECODE RECORD ENABLEbutton on or off. For non linear modes every sound clip is marked with astart timecode regardless of the state of the TIMECODE RECORDENABLE button.

4. Press the PLAY button to start the disk playing.

5. At the punch in point, hold RECORD and press the PLAY button. Therecord ready led will stop flashing and remain on.

6. Press PLAY to drop out of record. The GX8500 will continue playing asbefore the punch in point.

When the GX8500 is in record, individual tracks can be dropped in and out ofrecord using the TRACK CONTROL buttons.

Pre and Post Roll

PrerollThis menu heading allows the user to adjust the preroll time for rehearse andpunch in operations.

The preroll time is adjustable from 0 to 99 seconds.

PostrollThe postroll time is used by the auto punch in/out and rehearsal operations todetermine how far the recorder continues to play after the out point.

The postroll time is adjustable from 0 to 99 seconds.

P Record p$

P Prerollr s

0-99 sec

P Record p$

P Pstrollr s

0-99 sec



Cross Fading

Cross Fade ShapeThe GX8500 has three choices of crossfade shape. These can be used forperforming edits or joins where signal vary in their degree of correlation.

Mixing together two audio streams which have a low degree of correlation willproduce a dip at the centre point of the crossfade. This can be compensatedfor by using the cosine2 shape which boosts the midpoint. Conversely mixingtogether two audio streams with a high degree of correlation will produce again boost at the centre point which can be compensated for by using a linearcrossfade.

Cross Fade lengthThe cross fade length refers to the cross fade time in ms when performing apunch in or rehearsal.

When performing a punch in, the playback audio starts fading out at thepunch in point and the record signal starts fading in.

P Record p$

P X fd shr s

LinearCosineCos 2

P Record p$

P X fd lnr s

0-256ms

The GX8500 performs an anti click cross fade of 1ms when startingor stopping playback or when switching monitoring.

LINEAR COSINE COSINE2

-6dB

PLAYBACKAUDIO

RECORDAUDIO

LINEAR CROSS FADE

LENGTHIN ms

PUNCH IN POINT

CROSS OVER POINT



High Sample Rate Recording

176.4kHz and 192kHz Sample Rates

The GX8500 is capable of recording at higher than 96kHz sample rates.When 176.4kHz or 192kHz sample rates are selected the GX8500 uses theinput configuration menu to select the appropriate word clock frequency. Ifthe input configuration is dual wire, 96kHz is selected, if the inputconfiguration is quad wire, 48kHz is selected

The headphone D/A in the GX8500 is a 24bit/96kHz Device.

The monitor mixer picks out every other sample during high sample rateplayback, so that you can listen to a 176.4kHz or 192kHz version of yourrecording through the headphone socket.

SAMPLE RATEInputconfiguration

available 44.1kHz 48kHz 88.2kHz 96kHz 176.4kHz 192kHz

1 TrackSingleDualQuad

SingleDualQuad

SingleDualQuad

SingleDualQuad

DualQuad

DualQuad

2 TracksSingleDualQuad

SingleDualQuad

SingleDualQuad

SingleDualQuad

DualQuad

DualQuad

3 Tracks SingleDual

SingleDual

SingleDual


4 Tracks SingleDual

SingleDual

SingleDual





NU

MB

ER

OF R

EC

OR

D TR

AC

KS


Dual Wire: This mode uses 2 tracks to record 1 channel of data,Quad Wire:This mode uses 4 tracks to record 1 channel of data,

GX8500 Operational manual Rev 1.0 Synchronisation


Synchronisation

Timecode

Synchronisation sourceThis menu heading determines the source for the internal LTC timecodereader.

The timecode reader values are only relevant if the timecode generator is inGenlock mode. The LTC and biphase rates can be adjusted individually bythe LTC Rate and Biphase Rate menu headings.

Timecode FormatThis setting programs the rate and count sequence for the timecodegenerator. The TC Rate heading will flash on and off if the selected timecoderate does not match the rate for the currently open project.

Each project can have only one timecode rate. Going into record in anexisting non blank project will restore the timecode generator rate to matchthat of the project.

The GX8500 will ‘cross code’ if the generator rate is different to that of theproject. This is useful, for example, when locating to cues where the cuetimecodes were entered at a different rate to the recording on disk.

The setting is overridden by Genlock mode

Timecode GeneratorThe timecode generator drives the front panel timecode display, the LTCoutput on the rear panel and responds to timecode requests via the P2 port.

The generator can be loaded with different numbers depending on theplayback mode and the value of the TC Gen menu heading.

The Genlock setting only has an effect in chase mode and in stop. In factpressing the CHASE button automatically puts the generator into Genlockmode. Genlock means that the generator rate is locked to the timecodereader rate and hence to the incoming timecode rate. Also the timecodecount from the reader is jammed into the generator. In this mode you canthink of the generator as an identical copy of the incoming timecode.

The Rec Run and T.O.D headings load the generator with values which willbe used when recording. During playback the generator is loaded with valuesfrom the audio files on disk.

Rec Run loads the generator with one of two values when RECORD ispressed.

Either

P Sync p$

P SyncSrcr sLTC

Biphase

P Sync p$

P TC Genr s

GenlockRec runT.O.D

P Sync p$

P TC Rater s24F25F

29DF29NDF30DF

30NDF



1. The timecode value from the TC Load menu heading if one has beenentered.Or

2. The timecode value from the end of the previous recording if no TC Loadvalue has been entered.

Selecting T.O.D means that when pressing RECORD the generator is loadedwith the time of day from the on board real time clock chip. The time can bechanged in the PROJECTS|PRJDATA menu.

Stop TimecodeThe GX8500 can generate LTC even when stopped. This can causeproblems with some older synchronisers which don’t expect a machine to beable to read timecode at 0 speed.

Use the d.c. setting to stop timecode being produced at 0 speed.

Chase Locking

The GX8500 can chase or follow an external timecode or biphase signal inforward or reverse.

1. Press the CHASE button. The timecode generator will automatically gointo Genlock mode. If the incoming timecode is stationary or otherwiseinvalid, the led above the chase button will flash indicating ready to chase.When the GX8500 detects a valid timecode, lock is instantaneous. If areverse timecode is detected, the recorder will play backwards in realtime.

The GX8500 is capable of detecting a real reverse timecode such as onecoming from an analogue tape player, or a timecode where the biphase ismoving in a forward direction but the count sequence is backwards; this iscommon in PC based recorders.

Play back will stop when the GX8500 detects more stationary frames thanselected in the Flywheel menu heading.

2. The chase function can only be exited by pressing the stop button or thechase button.

The GX8500 can chase in two modes, Follow and Release.

In Follow mode, the playback rate and hence the pitch of the audio is lockedto the incoming timecode rate. As the incoming timecode rate slows down,then the pitch of the playback audio gets lower and vice versa. If thetimecode rate is too high to allow audible playback, playback is attemptedfrom only the track selected in the Spool Track Preference menu heading.

In Release mode, the GX8500 locks to the first valid incoming timecode andthen releases to its own clocks. This is useful for situations where you want toignore incoming timecode rate variations that would otherwise affect theaudio quality. An example would be where timecode is being supplied froman analogue tape track, which has a relatively low stability.

P Sync p$

P ChsModer s

FollowRelease

P Sync p$

P Stop TCr s

Still Frd.c.



If the timecode drifts away from the nominal rate in Follow mode, theGX8500 uses an interpolation algorithm to slow down or speed up theaudio while still providing a fixed sample clock output. The playback audiosamples do then not match those originally recorded and audio quality iscompromised. Wherever possible it is recommended to use Release modeto preserve audio quality.

FlywheelThe GX8500 will “Flywheel” if the time code that it is chasing drops out. Thismeans that playback will continue at the current rate until the timecodereappears.

The values represent how many frames must be lost before the GX8500 willassume that the incoming timecode has stopped and will stop playback.

.

Biphase rate control

You can choose biphase instead of timecode to control the position of themachine in chase. There values allow you to set the biphase rate to 2 or 10pulses per frame.

Biphase signals are fed in through the multiport connector at the rear of themachine.

The GX8500 uses a biphase to timecode rate converter to calculate it'sposition. Before selecting one of the biphase pulse rates for the first time, besure to select the appropriate timecode rate.

If biphase is selected while locking to a 29.97 video reference the GX8500plays back 0.1% slow, i.e., if the selected film rate is 24 frames per second,the actual playback speed will be 23.98 fps.

Adding an Offset

1. You can add an offset to the incoming slave timecode so that the GX8500will lag or lead the source machine.

2. Press the OFFSET button.

3. Use the keypad, VALUE buttons or the rotary control knob to enter anoffset.

4. The led above the OFFSET button turns on and stays on when a non zerooffset has been entered. The status of the offset led is nothing to do withpressing the offset button, it simply indicates a non zero offset.

5. Press the OFFSET button to return to the default timecode display.

Automatically Calculating an Offset

1. Turn chase off.

2. Check that the existing offset is 00:00:00:00

P Sync p$

P Biphrter s2pf

10pf

P Sync p$

P Flywh’lr s10fr20fr30fr



3. Press the offset button until 'DIFF' is displayed. The displayed timecode isthe difference between the current off disk timecode and the incomingexternal timecode.

4. Park the GX8500 and the external timecode source at the desiredpositions.

5. Press the green enter button to transfer the DIFF timecode to the offsettimecode. The offset led turns on to indicate a non zero offset.

When the chase button is turned on the DIFF display shows the differencebetween the incoming timecode and the current off disk timecode includingthe offset. This means the difference displays 00:00:00:00 when the GX8500is chase locked.

Presetting a time code

Timecode set (TC set) is used to load a fixed time into the timecodegenerator.

This is be done by selecting TC set in the Sync section of the SETUPmenu and typing in a timecode using the numeric keypad.

P Sync p$

P TC set

Hh:mm:ss:ff

GX8500 Operational manual Rev 1.0 Editing


EditingIn non linear mode the GX8500 can perform basic editing functions using theIn and Out point timecodes as markers. Edits can be performed across alltracks, on individual tracks, or on groups of tracks.

The upper led shows the edit function to be performed and the lower ledshows the selected tracks with an ‘e’ in the right hand character position. Themessage ‘All Tracks ‘ is displayed if all tracks are selected.

Tracks are marked for editing by using the VALUE buttons to select the trackand pressing the +/STORE button to tag or untag the track.

Prior to all editing functions mark the audio segment to be copied to theclipboard by entering In and Out points as described elsewhere in themanual.

CutCut copies the segment of audio bounded by the In and Out points to theclipboard, and joins the In and Out points together on the destination timeline

CopyCopy copies the segment of audio bounded by the In and Out points to theclipboard, and has no effect on the destination timeline.

PastePaste prompts for a destination In point before inserting the audio previouslystored in the clipboard to that point. If there is no audio in the clipboard, noaction is taken. If no In point is entered the process is aborted. Thedestination In point is entered in the usual way and overwrites the Source Inpoint. The Source In point can be recalled using locate memory 04.



EraseErase mutes the audio between the In point and Out points.

DeleteErase mutes the audio between the In point and Out point, and joins the Inand Out points together on the destination timeline

Program PlayProgram play allows up to 99 audio clips to be requenced, or to be played outin a different order to the original recording. The process relies on take pointsand/or end points marking the beginning and end of the clips to be played.Program Play will not work until take points have been entered marking thebeginning of each required clip. If no end points have been entered theGX8500 will playback each clip until the next take point less the preroll time isreached. If no further take points are reached, playback will continue until theSTOP button is pressed.

The two right hand characters of the upper display show a sequence number,and the lower display shows a list of all the take points within the openproject. Use the VALUE buttons to select a sequence number, and theROTARY CONTROL KNOB to select a take to be attached to that sequencenumber. Press the +/STORE button to attach the take to the sequencenumber. Each attached take number is shown with an exclamation mark inthe left hand corner of the upper display. You can unattach the take bypressing the -/CLEAR button at that sequence number or by attaching adifferent take number using the +/STORE button.

Press the ENTER button to activate Program Playback. The upper displaywill flash.

You can then locate to any point in the sequence and press the PLAY buttonas normal. Playback will start from the locate point and continue through theremainder of the sequence.

Press the ENTER button at the Program Play menu heading to cancelprogram playback and revert to the normal sequence.



Undo and RedoAll editing functions and overdubs can be undone and redone using thePREVIOUS and NEXT buttons

UndoTo undo the previous edit or punch in, hold the RECORD button down andpress the PREVIOUS button. The lower alpha numeric display shows thecurrent Undo level as a numeric value, 0 represents no actions have beenundone.

RedoTo redo the previous edit or punch in, hold the RECORD button down andpress the NEXT button. The lower alpha numeric display shows the currentUndo level as a numeric value, 0 represents no actions are left to be redone.

GX8500 Operational manual Rev 1.0 Control


Control

Local /RemoteIn local mode all front panel functions are available.

In remote mode only the local/remote setup menu heading is availablepressing a button while in remote mode will display a message indicating whythe function is not available.

RS422 Controller / ControlledThis setting configures how the GX8500 uses the RS422 port, located on therear panel.

If controlled (Slave) is selected, the GX8500 responds to a subset of Sony P2protocol command set.

The GX8500 responds to the following commands when in controlled mode,

00 11 Device type request (GX8500 device id is D0, C1)01 F2 A2 System control request (current timecode format).02 F2 22 Set timecode generator.04 F4 32 ID write, generates take point with specified number01 F8 01 enter take point01 F8 02 enter false start01 F8 03 enter note01 F8 04 enter end point01 F8 11 next take01 F8 21 previous take20 00 Stop.20 01 Play.20 02 Record.20 0F Eject.20 10 Fast forward, spools recorder forwards at x5.20 20 Rewind, spools recorder backwards at x520 11 Jog forward at variable speed.20 12 VAR forward at variable speed.20 13 Shuttle forward at variable speed.20 21 Jog reverse at variable speed.20 22 VAR reverse at variable speed.20 23 Shuttle reverse at variable speed.2x 31 Locate and play from specified timecode.20 37 Chase20 63 Select EE on, sets auto input on.20 64 Edit off, drops out of record, sets auto input off.20 65 Edit on, drop into record.40 30 Edit preset, sets record enables.45 78 Chase offset preset.60 30 Edit preset sense.60 58 Sample rate sense.61 0C Timecode sense.61 20 Status sense, for transport control status.61 78 Chase offset sense.

P Control p$

P Lcl/Remr sLocal

Remote

P Control p$

P RS422r s

MasterSlave



If controller (Master) is selected, the GX8500 will transmit record and stopcommands to other controlled devices such as DAT recorders. Pressing thetake button will send a program number with an index matching the takenumber. Note that most DAT recorders require 9 seconds to write an ID, sorapid pressing of the take button will cause the DAT recorder to miss IDpoints. You can use this facility to automatically run a DAT backup of asession.

RS422 EmulationThe GX8500 can emulate a range of machines via the RS422 serial port.

This allows the user to match the feature set of the remote controller with theGX8500.

P Control p$

P RS422emr s

GX8000DA88

PCM800PCM7030PCM7050BVU800BVU850BVW75



Parallel I/O

The GX8500 has 16 parallel input lines which can be assigned to any of theabove functions. The selected function is ‘tallied’ back through the associatedoutput line. In addition the polarity of the input can be changed to active highor low. The following diagram details the input and output circuits used.

P Control p$P Parallel p

P P P P PInput 1 Input 2 3 to 14 Input15 Input16 Pol’rtyr s r s r s r s r s r s

Rec arm1 Rec arm1 Rec arm1 Rec arm1 Act HighRec arm1 Rec arm1 Rec arm1 Rec arm1 Act LowRec arm1 Rec arm1 Rec arm1 Rec arm1Rec arm1 Rec arm1 Rec arm1 Rec arm1Rec arm1 Rec arm1 Rec arm1 Rec arm1Rec arm1 Rec arm1 SAME Rec arm1 Rec arm1Rec arm1 Rec arm1 AS Rec arm1 Rec arm1Rec arm1 Rec arm1 I/P1+I/P2 Rec arm1 Rec arm1Rev Sp’l Rev Sp’l Rev Sp’l Rev Sp’lRev Play Rev Play Rev Play Rev Play

Stop Stop Stop StopPlay Play Play Play

Fwd Sp’l Fwd Sp’l Fwd Sp’l Fwd Sp’lRecord Record Record Record

Previous Previous Previous PreviousNext Next Next Next

-10 Secs -10 Secs -10 Secs -10 Secs+10 Secs +10 Secs +10 Secs +10 Secs

Take Take Take TakeF/S F/S F/S F/S

Note Note Note NoteEnd End End End

Chase Chase Chase ChaseAllinput Allinput Allinput AllinputFader Fader Fader Fader



PC

B #

P12

60

GX

8500

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8

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7

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C148

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C149

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VCC

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U65A

NATSEMI DS9637AC SO-8

8 72

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R119

3K3

R121

10K

R120

1K

C151

33pF

C150

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R122

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VCC

GND

U65B

NATSEMI DS9637AC SO-8

6 53

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C152

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1K5

R123

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RPACK-4 2K2

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RP22

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RP25

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RP26

RPACK-4 2K2

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RP30

RPACK-4 2K2

1 2 3 45678

RP31

RPACK-4 2K2

1 2 3 45678

RP34

RPACK-4 2K2

1 2 3 45678

RP36

RPACK-4 2K2

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RP21

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12345

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RP27

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RP35

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RP23

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RP28

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RP32

RPACK-4 2K2

1 2 3 45678

RP18

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RP24

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RP29

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D26

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1N4001

U60

74ACT244 SO-20 0.3" WIDE

2 4 6 8 11 13 15 17 1 19

18 16 14 12 9 7 5 3

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1A2

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2A1

2A2

2A3

2A4

1G 2G

1Y1

1Y2

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U59

TIL199N DIP-16

1 3 5 72 4 6 8

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1 3 5 72 4 6 8

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U63

TIL199N DIP-16

1 3 5 72 4 6 8

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C3

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U53

TIL199N DIP-16

1 3 5 72 4 6 8

15 13 11 916 14 12 10

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K3

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C1

C2

C3

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U58

TIL199N DIP-16

1 3 5 72 4 6 8

15 13 11 916 14 12 10

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E2

E3

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C145

0.1uF

U55

74ACT273 SO-20 0.3" WIDE

3 4 7 8 13 14 17 18 11 1

2 5 6 9 12 15 16 19

20 10

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D2

D3

D4

D5

D6

D7

D8

CLK

CLR

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Q2

Q3

Q4

Q5

Q6

Q7

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U57

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1 3 5 72 4 6 8

15 13 11 916 14 12 10

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K2

K3

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E2

E3

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C1

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U61

74ACT273 SO-20 0.3" WIDE

3 4 7 8 13 14 17 18 11 1

2 5 6 9 12 15 16 19

20 10

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D2

D3

D4

D5

D6

D7

D8

CLK

CLR

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Q2

Q3

Q4

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Q6

Q7

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VCC GND

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15 13 11 916 14 12 10

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A2

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K2

K3

K4

E1

E2

E3

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C1

C2

C3

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TIL199N DIP-16

1 3 5 72 4 6 8

15 13 11 916 14 12 10

A1

A2

A3

A4

K1

K2

K3

K4

E1

E2

E3

E4

C1

C2

C3

C4

U54

74ACT244 SO-20 0.3" WIDE

2 4 6 8 11 13 15 17 1 19

18 16 14 12 9 7 5 3

20 10

1A1

1A2

1A3

1A4

2A1

2A2

2A3

2A4

1G 2G

1Y1

1Y2

1Y3

1Y4

2Y1

2Y2

2Y3

2Y4

VCC GND

C144

0.1uF

CON17

50 WAY BOX HEADER

12

34

56

78

910

1112

1314

1516

1718

1920

2122

2324

2526

2728

2930

3132

3334

3536

3738

3940

4142

4344

4546

4748

4950

U64

NEWPORT NME0505S

21

34

VCCGND

ISO-ISO+

+

C213

10uF/16V

C214

0.1uF

/PARALLELRD/PARALLELRESET/PARALLELWRBD[0:15]

QUADAQUADB

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Isolation 4mm

Layout note: Isolate this area from the rest

of the PCB to guard against ESD / RFI. Try

ensure no track from this 'live' side passes

within 4mm of any of the rest of the PCB



Multi Machine Operation

Multiple GX8500 recorders can be locked together in applications wheremore than 8 tracks are required.

1. Each recorder must be assigned track numbers. The unit that recordstracks 1-8 is the master machine.

2. From the setup menu designate the master by selecting 'mastr1-8' in the'Multi-mc' menu heading in the “Control” section.

3. Designate the other machines to be slaves by selecting one of the 'slv x-y'choices. Make sure there are no gaps, for example, if you are locking 3GX8500's together, they must be set to 'mastr 1-8', 'slv 9-16' and 'slv 17-24'.

4. Connect the recorder's as shown in the above diagram. Starting from themaster recorder, connect the link output to the RS232 input of the 1stslave, and the link output of the 1st slave to the RS232 input of the 2ndslave etc. The last slave recorder (the one with the highest track numbers)will have its link port unconnected.

5. Starting from the master recorder, connect the 'ext clk' output to the 'extclk' input of the 1st slave, and the 'ext clk' output of the 1st slave to the 'extclk' input of the 2nd slave etc. Make sure that all slave recorders arelocked to external word clock.

P Control p$

P MultiMCr soff

mast1-8slv9-16

slv17-24slv25-32slv33-40slv34-48

DSD IN

DSD OUT

SDIF2 IN

SDIF2 OUT

AES I/O

RS232 RS422 LINK

MULTI PORT

EXT CLKIN OUT

THRUVIDEOIN

GXNET

AES / EBUMONITOR MIX

IN OUT

LTCSMPTE / EBU

IN OUT

PUSH

PUSH

7 85 61 2 3 4

GAINANALOGUE IN

8 Channel, 24bit 96KHz A/D Converter Module

7 85 61 2 3 4

GAINANALOGUE OUT

8 Channel, 24bit 96KHz D/A Converter Module

CAUTIONRISK OF ELECTRIC SHOCK

DO NOT OPEN

ATTENTION:NE PAS OUVRIR

RISQUE DE CHOC ELECTRIQUE

WARNING:SEE INSTALLATION INSTRUCTIONSBEFORE CONNECTING TO THE SUPPLY.THIS APPARATUS MUST BE EARTHED.

AC IN (90-240 VAC)

SCSI

DSD IN

DSD OUT

SDIF2 IN

SDIF2 OUT

AES I/O

RS232 RS422 LINK

MULTI PORT

EXT CLKIN OUT

THRUVIDEOIN

GXNET

AES / EBUMONITOR MIX

IN OUT

LTCSMPTE / EBUIN OUT

PUSH

PUSH

7 85 61 2 3 4

GAINANALOGUE IN

8 Channel, 24bit 96KHz A/D Converter Module

7 85 61 2 3 4

GAINANALOGUE OUT

8 Channel, 24bit 96KHz D/A Converter Module

CAUTIONRISK OF ELECTRIC SHOCK

DO NOT OPEN

ATTENTION:NE PAS OUVRIR

RISQUE DE CHOC ELECTRIQUE

WARNING:SEE INSTALLATION INSTRUCTIONSBEFORE CONNECTING TO THE SUPPLY.THIS APPARATUS MUST BE EARTHED.

AC IN (90-240 VAC)

SCSI

EXT CLK OUT

LINK

MIX IN

EXT CLK IN MIX OUT

RS232

SLAVE 9-16

MASTER 1-8



6. Starting from the master recorder, connect the “Monitor Mix” input to the“Monitor Mix” output of the 1st slave, and the “Monitor Mix” input of the1st slave to the “Monitor Mix” output of the 2nd slave etc. This ensuresthat the monitor mix output from all locked recorders is added togetherand is available on the master recorder.Remember that the monitor mix is output digitally via the“Monitor Mix”output, and as an analogue signal through the headphone output.

Setting a recorder to be a slave locks out front panel control of all transportand chase functions. These functions can only be controlled through themaster recorder, either locally, or by a RS422 remote controller like theGXR48, or by a PC running the GXR remote software. Record enables areavailable locally from each machine as are monitor mix functions.

The recorders are locked to word clock accuracy so it is possible to recordstereo pairs across recorders, but it is not recommended for convenience.

The GXR48 Multi machine remote controller

Up to 6 GX8500 can be linked together on any one of the 3 ports of theGXR48 creating a 48-Track multitrack on each port.

Contact your local Genex dealer for further information.

GX8500 Operational manual Rev 1.0 Take Logging System


The GX8500 Take Logging System

What are Cue Points?

Cue points are records of events that happened during a recording. An eventcould be music starting, a wrong note, the start of a new page, a false start,etc. The GX8500 allows you to log each type of event as it happens, as a cuepoint, so that you can quickly and easily find it again.

Eight different cue point's are available (four are accessible from the GXRremote software only). Each can have a different name and characteristic.There are five available characteristics,

1. normal 1 - logs the timecode at the time of entry and auto increments thecue point number. The number can be manually preset by the user.

2. normal 2 - standard with auto incrementing count, preset to 1 by takepoint.

3. normal 3 - standard with no count.

4. retro 1- this type of cue point logs a timecode at the time of entry, butswaps names with the cue point immediately before it. A good example ofit's use is as a false start indicator. Suppose 'take' was pressed attimecode 00:23:15:00 when the orchestra or band started playing, butshortly afterwards at timecode 00:23:21:00, the music broke down andstarted again - you could the enter a retro type cue point so that the falsestart would be logged at 00:23:15:00 and the point at 00:23:21:00 wouldbe relabelled take, as shown below.

5. retro 2 - retro with no count.The cue point definitions stored in the disk directory override those stored inthe battery backed ram of the unit for all cases but record. In other words thecue point definitions stored on disk will be used for locating, playback etc.

Cue point definitions can only be changed on a blank disk

Cue list before retro cue point enteredtake 001 00:08:04:00take 002 00:15:33:00take 003 00:23:15:00Cue list after retro cue point entered at 00:23:21:00take 001 00:08:04:00take 002 00:15:33:00false start 001 00:23:15:00take 003 00:23:21:00



Entering Cue Points

Cue points can be entered in playback or record. In playback, cue points areinserted in the current cue list. In record, cue points are appended to thecurrent cue list.

1. Press the CUE COUNT button to set the count for the next entered cuepoint. The number shown in the alpha numeric display represents thenumber that will be entered when the associated cue point button is nextpressed.

2. Select the required cue point number with the PARAMETER buttons.

3. If a change is required, enter the new cue count number using theNUMERIC KEYPAD.

4. Press the Cue Count button again to switch the display back to timecode.

5. Put the GX8500 into play or record.

6. Press the CUE button unit the led above the button turns on.

7. At the desired timecode press the track control button associated with therequired cue point. The entered cue point will be momentarily displayed.

C u e n o ’s

0 0 1



Autocue

You can choose to automatically add cue points while recording.

A take point can be added every time the GX8500 starts recording or,

a take point is entered only when a preset threshold is exceeded, and an endpoint is added when the audio level then drops below the threshold.

Available thresholds are 'silence', '-80dB', '-70dB', '-60dB', '-50dB', and '-40dB'.The 'off' setting disables the auto cue utility.

The 'silence' setting represents a threshold of zero (digital silence).

Adjusting Previously Entered Cue Points

Adjusting the Cue Point Timecode Using the Jog Wheel

You can audibly trim cue points using the jog/scrub function of the GX8500.This is useful when it is necessary to accurately trim a point to a particularattack or phrase in the audio.

1. Press the LOCATE button until one of the current cue points is displayedin the lower alpha numeric display.

2. Use the VALUE buttons or the ROTARY CONTROL KNOB to select thedesired cue point.

3. Press the JOG button so that the jog led is on.

4. Use the ROTARY CONTROL KNOB to adjust the audio to the new point.

5. Press the green enter button to store the change.Cue points can be deleted and cue point lists renumbered from the frontpanel while in playback or stop.

Deleting Cue Points

1. To delete a cue point press the LOCATE button until the list of cue pointsappear in the display.

2. Use the ROTARY CONTROL KNOB to select the cue point to delete.

3. Press the -/CLEAR button. A prompt to delete the cue point shouldappear.

4. Press the green ENTER button to confirm the deletion. If no action istaken for approx. 4 seconds the delete message disappears.

The auto cue setting is not stored in the internal nvram. The GX8500powers up with auto cue off.

P Take Log p$

P AutoCuer sOff

RecordSilence-80dB-70dB-60dB-50dB-40dB



Renumbering Cue Points

1. Press the LOCATE button until the list of cue points appear in the display.

2. Use the ROTARY CONTROL KNOB to select the start point for therenumbering.

3. Press the -/STORE button. A prompt to renumber the cue point sequenceappears.

4. Press the green ENTER button to confirm the operation. If no action istaken for approx. 4 seconds the delete message disappears.

Renumbering is an instant process, unlike a DAT machine the unit does nothave to play the disk to reorder the sequence.

Reference Cue Menu Heading

This menu heading sets the file or cue point type for display and reference.

The selected cue point type will be used as a reference for all subsequentlocating and playback operations.

For example, suppose you select take and press the green 'enter' button toconfirm the selection. When you exit the menu the current take number willbe displayed in the lower alpha numeric display on the front panel. The'previous' and 'next' buttons will locate to the previous and next take points,and pressing play while the pause light is off, will make the recorder play fromthe beginning of the current take.

During playback the recorder updates the current take display using timecodeinformation.

The ref cue setting is stored in the recorder's non volatile memory.

Renumbering uses the number of the selected cue point as a start count.For example, if the current take list is ordered as 1,2,5,3,4 and take 5 isselected as the renumbering start point, then the sequence afterrenumbering will be 1,2,5,6,7

P Take Log p$

P Ref Cuer sTakeF/S

NoteEnd

GX8500 Operational manual Rev 1.0 SCSI


SCSIThe internal SCSI2 bus is brought out to a 50 way centronics connector atthe rear of the unit to allow support for multiple SCSI storage devices. Thebus is terminated at the onboard SCSI controller and should be terminated atthe last SCSI device on the bus. If no external drive is connected, the busshould be terminated by plugging a terminator into the unused SCSI rearpanel connector. Some GX8500 models have a DIP switch next to the rearpanel SCSI connector that allows the SCSI termination to the internal drive tobe switched on and off.

Current DriveThe GX8500 can access either the internal drive or any external SCSIstorage device. The display shows all drives currently connected to the SCSIbus. Each character position on the lower display represents one possibleSCSI ID. ID 0 is the leftmost character, ID 7 is the rightmost character. If adrive is successfully logged, its ID will be displayed in the relevant position.The currently active drive is shown as a flashing character. The initiator ID isrepresented by the character ‘I’. Normally the initiator has an ID of 7; in thiscase the character ‘I’ will appear in the rightmost character of the lowerdisplay.

If there is a SCSI drive connected to the bus, but it is not shown on thedisplay, press both VALUE buttons simultaneously to rescan the SCSI bus.

Select any logged drive for recording or playback by using the VALUEbuttons to position the cursor over the required device. Press the greenENTER button to confirm the selection.

You can only change active drives only when the recorder is stopped

DSP/Initiator SCSI IDThis menu displays the SCSI ID of the initiator (the DSP control board).

Select SCSI > DSPSCSI from the setup menu.

Use the VALUE buttons to select a different SCSI ID if required, or if theexisting initiator ID conflicts with another initiator on the bus, for example, aSadie workstation. Don’t forget to confirm the selection with the greenENTER button.

Using the External SCSI PortThe external SCSI port at the rear of the GX8500 provides a flexible interfaceto external storage devices and digital audio workstations.

Playing and Recording with an External DriveOnce an external device has been logged it can be used for all functions inthe same way as the internal drive. Just use the SCSI > CurDisk diskheading to toggle between the internal and the external drive.

Increasing Recording Capacity using External DrivesRecord capacity can be effectively increased by using an internal andexternal drive as if they were one larger drive.

P SCSI p$

P CurDisk

- - 2 - - - - I

P SCSI p$

P DSPSCSI

ID = 7

GX8500 Operational manual Rev 1.0 SCSI


1. Log the external drive. Select the drive from which you want to start therecording.

2. Start recording as normal. When the recording reaches the end of thecurrent disk, the action taken by the GX8500 depends on the recordmode.

If the record mode is append and the disk loaded into the next drive is notblank, recording will stop.

If the record mode is append and the disk loaded into the next drive isblank, recording will proceed seamlessly onto the next disk.

If the record mode is insert and the disk loaded into the next drive is notblank, the GX8500 will update the directory of the next drive to match thesample rate, timecode rate and number of tracks of the current drive andcontinue recording.

If the record mode is non linear, recording will commence on the nextdisk/drive in sequence when the FAT of the current disk/drive is full. Thecurrently open project will be written to the next disk/drive and recordingwill continue as normal. Note that only the last disk/drive in sequenceholds the entire project data.

3. Pressing eject will eject the disk that isn't being used for playback orrecord, or if the machine is in stop the GX8500 will eject the currentlyselected disk.

This switching process will repeat indefinitely as long as there is a disk ordrive available.

If the disks are Genex formatted, then no projects are built and it is essentialto correctly label the disks in sequence. The playback side of the Genex multidrive operation is dumb in the sense that it doesn't prompt you for the nextdisk in sequence. If the incorrect disk is loaded then playback simplycontinues with the wrong audio!

GX8500 Operational manual Rev 1.0 Display


Display

Timecode DisplayThe timecode display can be translated to a feet and frames display for filmdubbing applications. If you are using the feet and frames display you mustmake sure that the correct film stock is selected by the Film Stock Type menuheading.

Film BeginningThe film beginning timecode is subtracted from the playback timecode toallow each film reel to be referenced from 0.

Film Stock TypeThe type of film stock can be set using this heading.

The setting affects the feet and frames display only.

PPM peakThis heading determines the characteristics of the peak hold for the frontpanel PPM's.

If off is selected no peak information is stored, and the PPM's descendnormally.

If on is selected peak bars remain permanently on until cleared by the clearpeak hold button.

If delay is selected peak bars remain on until a delay period has elapsed. Thedelay period is factory set to 5 seconds.

Note that the overload led's on the PPM display override all settings underthis menu heading. If triggered they will remain on until cleared by the clearpeak hold button.

P Display p$

P T/C Dispr sLTCft & fr

P Display p$

P PPM peakr soff

delayon

P Display p$

P Film Begr s

xxxxxxxx

P Display p$

P FilmTypr s

16mm, 24f16mm, 25f35mm, 24f35mm, 25f

GX8500 Operational manual Rev 1.0 Display


PPM overThe overload led’s light upon continuous detection of peak level for thenumber of samples selected here.

Vary this setting to match the overload detection to that of an external ADCwhich may not flag an overload immediately.

The overload led’s stay on regardless of the PPM display menu heading andcan only be cleared using the ‘CLEAR PEAK HOLD’ button.

PPM ScaleYou can expand the PPM scale to cover just 2dB from the top to the bottom,for the purposes of calibration of internal and external ADC’s. The centrepixel can represent –16dBFS, -18dBf=FS, -20dBFS or –22dBFS. Use theVALUE buttons to select the appropriate alignment level.

In expand mode two pixels light for each PPM column until the incoming levelis aligned. One pixel shows the incoming level and the centre pixel flashesuntil the incoming level matches the alignment level. If the incoming level isoutside of the expanded range, the bottom or top pixel stays lit to indicate thedirection of the error.

Expand mode can be cancelled by selecting Normal.

Frames on/offThis heading allows the user to blank the frames section of the timecodedisplay on the front panel. Some users prefer to blank these characters tomake the timecode more readable.

P Display p$

P PPMoverr s

1 Sample2 Sample3 Sample4 Sample5 Sample6 Sample

P Display p$

P FinePPMr s

Normal-22dB +/-1-20dB +/-1-18dB +/-1-16dB +/-1

P Display p$

P Framesr sOffOn

GX8500 Operational manual Rev 1.0 Sadie


SadieGenex audio files can be edited directly using the Sadie workstation. InSADIE mode the GX8500 emulates a SADIE hard drive so that the filesrecorded in Genex format appear as SADIE files to the SADIE workstation.

Sadie ProfilesIf profiles are required while editing under SADIE emulation, then turn profileson before recording.

SADIE is capable of regenerating audio profiles should you forget to turnprofiles on before recording.

Sadie PartitionSADIE can write project and/or playlist data to a GENEX disk. To do this anarea must be reserved before the disk is formatted. The reserved areareduces the time available for recording by a small amount that depends onthe number of tracks, bits per sample and sample rate being used on thecurrent disk. The SADIE partition occupies approx 5Mbytes of disk space.

To set a partition,

1. Set the partition heading on,

2. Format the disk.This heading is only applicable for Genex formatted disks.

Sadie EmulationSelecting Sadie on puts the GX8500 into Sadie emulation mode. The onlybuttons that are active in this mode are the VALUE buttons and the ENTERbutton to exit Sadie mode.

To configure the GX8500 for Sadie emulation, connect the GX8500 SCSI busto the SADIE SCSI bus. The GX8500 uses a minimum of two SCSI ID’s, onefor the initiator and one for the drive or drives containing the audio. You willprobably need to reconfigure the GX8500 initiator SCSI ID to be different tothe SADIE initiator ID. Use the SCSI > DSPSCSI menu heading to do this.

The SADIE workstation can then be used to log the GX8500 as if it were aSADIE formatted drive.

P Record p$

P Profiler sOffOn

P Record p$

P Partitnr sOffOn

P SCSI p$

P Sadier sOffOn

GX8500 Operational manual Rev 1.0 System


System

Diagnostics

Serial Number

Each GX8500 has a unique serial number which can be displayed on thefront panel alpha numeric displays. This serial number is used incommunications with the GXR remote software and the GXR48 hardwareremote controller.

Software / FPGA Revision

You can use this setting to identify what revisions of softwareare currently installed in your GX8500.

There are two separate revision numbers, the FPGA revisionand the Firmware Revision.

Both sets of software can be user upgraded as features are added to theoperating system, Upgrades and other software can be found on the GenexResearch web site at:

http://www.genex.co.uk

Or contact your local genex dealer for futher information.

Details on how to upgrade your system can be found in the “Downloadingnew software via the internet” section of this manual.

P Diagnose p$

P Serial #$

nnnnnnn

P Diagnose p' (

P FPGARev P FWarRev$ $

Vx.xx.xx Vx.xx.xx



Drive typeThis menu heading shows the “currently selected” drive model. For example“SMO-F551” (Sony 5.2GB MO DRIVE). The string is read from the drive anddisplayed directly.

Press the VALUE button to toggle the display between model number anddrive firmware revision.

Timecode AnalysisThis read only display shows the frequency of the internal timecodegenerator. Note that this is not necessarily the same as the timecode framecount. The display simply measures the distance between frame sync edgesin the timecode signal. It can be used to determine the stability of thetimecode for chase purposes and helps the decision as to whether to usechase follow or chase release.

Sine Wave Generation

These two menu settings will set the internal digital sinewave generator this can be used for calibration of internaland external devices and can be routed to any or alltracks from the “ROUTING” section of the setup menu.

Ethernet ID

P Diagnose p$

P DrvType$

Xxxxxxxx

P Diagnose p$

P SineGen pP P

Rate Level$ $

Hz dB

P Diagnose p$

P Ethernt$

xxxxxxxx

P Diagnose p$

P TC Stat$

nn.nnfps



Downloading new firmware to a GXR48In this mode the GX8500 will act as an RS232 to RS422 converter allowingyou to upgrade the GXR48’s Firmware from a PC via a GX8500.

Connect the RS232 of your PC to the GX8500’s RS232 port. Connect theRS422 port of the GX8500 to COM3 of the GXR48 MULTI MACHINEREMOTE CONTROLLER.

From the GX8500’s setup menu Select “yes” in DIAGNOSE > GXR Upg

RS232 v. RS422A PC serial port uses the RS232 standard which is single ended andswitches between +/- 12V. The GXR48 controller has three RS422 serialports which are balanced and switch at +5V. To make things even morecomplicated a standard PC serial port runs at 19200 baud, as opposed to38400 baud for a P2 link.

1. Connect the RS422 port of the GX8500 to COM3 of the controller.

2. Press the GXR48’s SETUP button.

3. Use the GXR48’s PARAMETER buttons to select the TEST menuheading.

4. Use the GXR48’s VALUE buttons to select ON.

P Diagnose p$

P GXR Upgr sNoYes

RS232

RS422

RS232

GXR48

GX8500

PCRUNNING“GXR”



Press the GXR48’s green ENTER button to confirm the selection.

This switches the baud rate of COM3 to 19200 baud so that communicationwith a standard PC is possible.Note also that the internal timer is slowed down by this action and somebutton presses on the GXR48 may seem sluggish in this mode

DownLoading New Software via the Internet

The Genex Research web site holds the latest Software revisions for Genexproducts, including the latest Firmware updates for the GX8500.

1. Log onto http://www.genex.co.uk

2. Go to the “Download software” page.

GXR Remote Software

1. To download the GXR Remote Software you’ll need to download 3 files:-

genex.exegnx1.exegxr.zip

(GXR is a Windows based remote control device for PC’s and is the onlyway that you can upload new firmware into the machine)

2. Unzipping gxr.zip should create a file called gxr.bat

3. Run gxr.bat to install the GXR software on your PC. The software createsand loads into a directory called GXR.

4. Run gxr.exe to start the program. check that the version number is correct(the version number can be accessed using help[ About GXR] menuheading



GX8500 Firmware

1. To download GX8500 firmware. You need to download 1 file:-

gx8main.zip

2. Unzipping gx8main.zip should produce a file called gx8main.p

3. Copy gx8main.p to a floppy disk and follow the instruction below

Uploading New Firmware to the GX8500Firmware can only be updated using the GXR remote software

1. Connect a PC running the GXR remote software to the GX8500 byrunning an RS232 cable from the PC to the RS232 input at the rear of theunit.

2. Put a disk containing the new firmware into the floppy drive. Thedownload software requires the drive to be assigned as A:Select thecommunications diagnostics window from the menu bar

3. Enter the recorder ID (serial number) into the field to the right of the“Download” button, if it is not already present. If you don’t know theID/serial number of the GX8500 that you are uploading to, you can find itfrom the GX8500’s setup menu Ensure that the “Eight track” check box ishighlighted.

4. Click the download button

5. A confirmation window will appear. Click OK.

6. The message “Downloading file A:\GX8MAIN.P to the recorder” willappear, followed a few seconds later by a percentage complete.

RS232

RS232

GX8500

PCRUNNING“GXR”



7. The download process should take approximately 5 minutes.

8. Eventually the message “Download complete” will appear and thedisplays on the front panel of the GX8500 will read “Genex Research”.Switch off the GX8500, wait for about 10 Seconds and switch it on again.check that the unit powers up normally and that the software versionnumber in it’s setup menu matches that on the floppy disk.

9. If the download is stopped before completion for any reason, for examplethe RS232 cable is accidentally removed, switch the GX8500 off and onagain and repeat steps 4 to 9

GX8500 Operational manual Rev 1.0 Connections


12345

6789

12345

6789

Connections

• Before setting up this unit with other devices, turn this unit and all otherunits off.

• Pin connection of the XLR type connectors is standardised to the pin 1-Ground, pin 2-Hot and pin 3-Cold.

• Pin connections for the rear panel RS422 connector as viewed from therear of the unit are shown below.

• The RS422 connector is intended for Sony 9 pin protocol emulation. Thefemale rear panel connector is wired as a controlled device; a 'one toone' cable will allow the recorder to be controlled by an externalcontroller. To control an external device, use a cable that swaps transmitand receive.

RS422 Connector Pinout

1. GND

2. TRANSMIT DATA –VE

3. RECEIVE DATA +VE

4. GND

5. N/C

6. GND

7. TRANSMIT DATA +VE

8. RECEIVE DATA _VE

9. GND

• Pin connections for the rear panel RS232 connector as viewed from therear of the unit are shown below

RS232 Connector Pinout 1. GND

2. TRANSMIT DATA

3. RECEIVE DATA

4. N/C

5. GND

6. GND

7. MACHINE SYNC INPUT

8. GND

9. GND



1 2 3 4 5

6 7 8 9

The RS232 connector is intended to be connected to a PC running the GXRremote software.

• Pin connections for the rear panel LINK connector as viewed from therear of the unit are shown below

LINK Connector Pinout 1. N/C

2. RECEIVE DATA

3. TRANSMIT DATA

4. N/C

5. GND

6. N/C

7. MACHINE SYNC OUTPUT

8. N/C

9. N/C

The link connector is intended for connecting several GX8500 recorderstogether so that they can be controlled from one source. The linkconnector from a unit is connected to the RS232 connector of the nextand so on. The only restriction is the data capacity of the RS232 interface,but up to eight machines can be safely connected together. Link cablesare available from your Genex dealer.



Rear Panel 25 Way D' Type Pinouts

DSD INPUT1...DSD INPUT 1 14...GND2...DSD INPUT 2 15...GND3...DSD INPUT 3 16...GND4...DSD INPUT 4 17...GND5...DSD INPUT 5 18...GND6...DSD INPUT 6 19...GND7...DSD INPUT 7 20...GND8...DSD INPUT 8 21...GND9-13...N/C 22-25...N/C

DSD OUTPUT1...DSD OUTPUT 1 14...GND2...DSD OUTPUT 2 15...GND3...DSD OUTPUT 3 16...GND4...DSD OUTPUT 4 17...GND5...DSD OUTPUT 5 18...GND6...DSD OUTPUT 6 19...GND7...DSD OUTPUT 7 20...GND8...DSD OUTPUT 8 21...GND9-13...N/C 22-25...N/C

AES I/O1...1+2 IN A 14...1+2 IN B2...1+2 IN GND 15...3+4 IN A3...3+4 IN B 16...3+4 IN GND4...5+6 IN A 17...5+6 IN B5...5+6 IN GND 18...7+8 IN A6...7+8 IN B 19...7+8 IN GND7...1+2 OUT A 20...1+2 OUT B8...1+2 OUT GND 21...3+4 OUT A9...3+4 OUT B 22...3+4 OUT GND10...5+6 OUT A 23...5+6 OUT B11...5+6 OUT GND 24...7+8 OUT A12...7+8 OUT B 25...7+8 OUT GND13...N/C

1234567891 01 11 21 3

1 41 51 61 71 81 92 02 12 22 32 42 5



Rear Panel 25 Way D' Type Pinouts

SDIF2 INPUT1...SDIF2 INPUT 1 14...GND2...SDIF2 INPUT 2 15...GND3...SDIF2 INPUT 3 16...GND4...SDIF2 INPUT 4 17...GND5...SDIF2 INPUT 5 18...GND6...SDIF2 INPUT 6 19...GND7...SDIF2 INPUT 7 20...GND8...SDIF2 INPUT 8 21...GND9-13...N/C 22-25...N/C

SDIF2 OUTPUT1...SDIF2 OUTPUT 1 14...GND2...SDIF2 OUTPUT 2 15...GND3...SDIF2 OUTPUT 3 16...GND4...SDIF2 OUTPUT 4 17...GND5...SDIF2 OUTPUT 5 18...GND6...SDIF2 OUTPUT 6 19...GND7...SDIF2 OUTPUT 7 20...GND8...SDIF2 OUTPUT 8 21...GND9-13...N/C 22-25...N/C

A/D and D/A OPTIONS (IF FITTED)1...CHAN 8 HOT 14...CHAN 8 COLD2...CHAN 8 GND 15...CHAN 7 HOT3...CHAN 7 COLD 16...CHAN 7 GND4...CHAN 6 HOT 17...CHAN 6 COLD5...CHAN 6 GND 18...CHAN 5 HOT6...CHAN 5 COLD 19...CHAN 5 GND7...CHAN 4 HOT 20...CHAN 4 COLD8...CHAN 4 GND 21...CHAN 3 HOT9...CHAN 3 COLD 22...CHAN 3 GND10...CHAN 2 HOT 23...CHAN 2 COLD11...CHAN 2 GND 24...CHAN 1 HOT12...CHAN 1 COLD 25...CHAN 1 GND13...N/C

1234567891 01 11 21 3

1 41 51 61 71 81 92 02 12 22 32 42 5



Rear Panel MULTIPORT Pinout

1. INPUT 1

2. INPUT 2

3. INPUT 3

4. INPUT 4

5. INPUT 5

6. INPUT 6

7. INPUT 7

8. INPUT 8

9. INPUT 9

10. INPUT 10

11. INPUT 11

12. INPUT 12

13. INPUT13

14. INPUT 14

15. INPUT 15

16. INPUT 16

17. IN/C

18. OUTPUT 1

19. OUTPUT 2

20. OUTPUT 3

21. OUTPUT 4

22. OUTPUT 5

23. OUTPUT 6

24. OUTPUT 7

25. OUTPUT 8

26. OUTPUT 9

27. OUTPUT 10

28. OUTPUT 11

29. OUTPUT 12

30. OUT PUT 13

31. OUTPUT 14

32. OUTPUT 15

33. OUTPUT 16

34. ISOLATED +5V

35. ISOLATED 0V

36. N/C

37. O/P PULLUP

38. O/P COMMON

39. N/C

40. GND

41. BI-PHASE +VE

42. GND

43. BI-PHASE –VE

44. GND

45. N/C

46. N/C

47. N/C

48. N/C

49. N/C

50. N/C

MULTI PORT 1

34

17

50

33 18



Rear Panel ( No options fitted)CONNECTOR DISCRIPTION

AES/EBU INmonitor mix input

AES/EBU OUTmonitor mix output

LTCSMPTE/EBU Timecode reader input

LTCSMPTE/EBU Timecode generator output

RS232Communication with PC running the GXRremote software or with other GX8500.

RS422Communication with devices implementing theSony P2 protocol

LINKCommunication with slave GX8500 devices ina multi machine configuration.

DSD INChannels 1 to 8 DSD inputs

DSD OUTChannels 1 to 8 DSD outputs

SDIF2 INChannels 1 to 8 SDIF2 inputs

SDIF2 OUTChannels 1 to 8 SDIF2 outputs

AES I/OChannels 1 to 8 as AES/EBU signals.

MULTIPORT16 channel parallel control interface andbiphase input.

GXNET10MBs Ethernet port

SCSIConnection to external SCSI storage devicesand/or third party DAW’

DS

D IN

DS

D O

UT

SD

IF2

IN

SD

IF2

OU

T

AE

S I/

O

RS

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Rear Panel ( Analogue optionsfitted)

CONNECTOR DISCRIPTION

AES/EBU INmonitor mix input

AES/EBU OUTmonitor mix output

LTCSMPTE/EBU Timecode reader input

LTCSMPTE/EBU Timecode generator output

RS232Communication with PC running the GXRremote software or with other GX8500.

RS422Communication with devices implementing theSony P2 protocol

LINKCommunication with slave GX8500 devices ina multi machine configuration.

DSD INChannels 1 to 8 DSD inputs

DSD OUTChannels 1 to 8 DSD outputs

SDIF2 INChannels 1 to 8 SDIF2 inputs

SDIF2 OUTChannels 1 to 8 SDIF2 outputs

AES I/OChannels 1 to 8 as AES/EBU signals in andout

MULTIPORT16 channel parallel control interface andbiphase input.

GXNET10MBs Ethernet port

SCSIConnection to external SCSI storage devicesand/or third party DAW's

ANALOGUE INChannels 1 to 8 input to 24bit / 96kHzanalogue to digital converter

ANALOGUE OUTChannels 1 to 8 output from 24bit / 96kHzdigital to analogue converter

DS

D IN

DS

D O

UT

SD

IF2

IN

SD

IF2

OU

T

AE

S I/

O

RS

232

RS

422

LIN

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interstagePhistersvej 31, 2900 Hellerup, Danmark

Telefon 3946 0000, fax 3946 0040www.interstage.dk

- pro audio with a smile

http://www.interstage.dk/

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