Alesis AI-2 Reference Manual
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Alesis AI-2 Reference Manual

Alesis AI-2 Reference Manual

Interface device for the alesis adat 8-track digital audio tape recorder
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AI-2
Reference Manual

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Summary of Contents for Alesis AI-2

  • Page 1 ALESIS AI-2 Reference Manual...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1: INTRODUCTION 1.0 ABOUT AI-2 ... 1 1.1 IMPORTANT NOTES ABOUT THIS MANUAL ... 3 1.2 OVERVIEW OF MAIN FUNCTIONS ... 3 1.2A Multiple Control Methods... 3 1.2B Control of ADAT Functions... 3 1.2C Reading and Saving Data ... 4 1.2D Reference Select...
  • Page 3 4.6 TRIM AN OFFSET ... 29 4.7 USING CUE TIMES ... 29 4.8 SAVING TO TAPE ... 30 4.9 CUSTOMIZING THE SETUP ... 30 4.10 RESET THE AI-2 ... 30 CHAPTER 5: OPERATIONAL FEATURES 5.0 MODES OF OPERATION... 31 5.1 NORMAL MODE ... 31 5.2 SET/HOLD MODE ...
  • Page 4 6.5I Tracks Menu ... 59 CHAPTER 7: ADVANCED FEATURES 7.0 ADAT DIGITAL INPUT ... 61 7.1 AI-2 DISPLAY INFORMATION ... 61 7.1A Time Code and Position Error Displays... 61 7.1B Time Code Number Differences ... 62 7.2 ALL SAFE... 62 7.3 MIDI INTERFACING ...
  • Page 5 CHAPTER 8: APPENDICES 8.0 APPENDIX 1: SPECIFICATIONS... 67 8.0A Operating Codes ... 67 8.0B Reference Sources... 67 8.0C Time Code Reader ... 67 8.0D ADAT Synchronizer ... 68 8.0E Control ... 68 8.0F Front Panel ... 68 8.0G Electrical... 68 8.0H Interconnections ...

  • Page 6: About Ai-2

    Simple Installation. AI-2 installation is extremely simple, the • AI-2 is a 1 Unit high product which is designed to fit into an industry standard 19" wide rack. All interface connections are made with standard connectors and the AC supply is a conve- nient wall mounting transformer.
  • Page 7 The AI-2 intelligently handles all the existing tape header data so that it can be restored to tape non-destructively. AI-2 information saved to a new tape can also be used by a BRC in future sessions. Editor and Synchronizer Control. The AI-2 permits ADAT •...

  • Page 8: Important Notes About This Manual

    Getting Started in this manual, and the sections on Formatting in the ADAT Reference manual before you start using the AI-2. At a later date we recommend that you read the entire manual to acquaint yourself with the many AI-2 features that you'll only discover by reading the manual.

  • Page 9: C Reading And Saving Data

    MIDI devices. This means that each time a new ADAT tape is put in the machine the AI-2 will be able to read all the associated Cue or Song times and you will be able to synchronize the tapes, effortlessly.

  • Page 10: E Status Leds And Messages

    The AI-2 front panel has eight LEDs that constantly indicate system status. In addition these LEDs are programmed to flash and warn the operator if there is a problem. The AI-2 also has a display message system which gives tape status, system status and error or warning messages when they occur 1.2F Block Diagram...

  • Page 11: Input Control Modes

    1.3 INPUT CONTROL MODES The AI-2 can be controlled by one of four methods. 1. The AI-2 and the attached ADATs are controlled by a video editor, or similar device, via a RS422 cable using standard Sony protocols. The AI-2 emulates the functionality of the Sony PCM- 7030 digital audio tape recorder.

  • Page 12: Engaged" Vs. "Disengaged" Tapes

    The AI-2 will disengage the ADAT tape if it receives an Allstop command and will engage the tape on receiving any transport command, including Stop. The ADAT transport will automatically disengage the tape to minimize wear if no transport activity occurs after a period of 4 minutes.

  • Page 13: Chapter 2: Installation

    CHAPTER 2: INSTALLATION The AI-2 is a 1 unit high 19" Rack mount device. We recommend that you install the AI-2 in the same rack or close to the ADAT transports, permitting connection to the first ADAT transport with a standard ALESIS 9-pin sync cable.

  • Page 14: Reference Connection

    -20 to +10 dBm. Connect a Longitudinal Time Code (LTC) feed to this input when it is required to resolve the speed of the system to time code or use the AI-2 as a time code chase synchronizer for the ADATs.

  • Page 15: Control Connection

    Kbits per second. The editor port communications are Sony serial protocol. Connect a 9-pin RS422 cable from an editor port to this socket when it is required to control the AI-2 from a video editor. The AI-2 emulates the SONY PCM-7030 digital audio tape recorder, for best results select this device driver in the editor.

  • Page 16: D Midi Out

    MIDI controller that requires MIDI responses. 2.4 BRC CONNECTION The AI-2 BRC connections are used to connect a BRC to the AI-2. Connectors are provided for MIDI, time code and word clock. These signals are used to control the BRC which in turn controls the connected ADATs.

  • Page 17: E W/C Out

    BRC. 2.5 ADAT CONNECTION The AI-2 ADAT connection is used to connect the AI-2 to the first ADAT machine, Successive ADATs are connected in turn, sync out to sync in. This connector is not used when a BRC is configured as part of the system.

  • Page 19: Chapter 3: Applications

    The AI-2 is designed to quickly and effectively integrate the Alesis ADAT digital audio tape recorders into studio and post production facilities. The AI-2 can be used for a wide range of applications, from basic chase synchronization to full control of 16 ADAT transports from a video editor.

  • Page 20: Interfacing To One Or More Adat's

    BRC/ADAT LED on the front panel of the AI-2 should be illuminated, to indicate that valid communication is occurring between the AI-2 and the ADAT units. If the LED does not light (no communications) or is flashing (communication taking place, but with errors) then recheck the cable connections.

  • Page 21: Interfacing To The Brc

    BRC. Two standard MIDI cables from AI-2 MIDI IN to BRC MIDI OUT, and from AI-2 MIDI OUT to BRC MIDI IN. A standard BNC to BNC coaxial cable from AI-2 W/C OUT to BRC 48 KHz IN and a mono or stereo jack plug to jack plug cable from AI-2 GEN OUT to the BRC SMPTE input.

  • Page 22: Interfacing To A Video Editor

    ADAT tracks or machines. Connect a standard RS422 cable from the 9-pin EDITOR connector in the control section of the AI-2 rear panel to a control output port on the editor. Connect a video reference signal to the VID IN connector in the reference section of the AI-2 rear panel.

  • Page 23: Interfacing To The Lynx-2 Or Micro Lynx

    Connect a video reference signal to the VID IN connector in the reference section of the AI-2 rear panel. For a Lynx-2 or Micro Lynx system, it is not necessary to connect a video reference to the AI-2...
  • Page 24 REF (OPT) When the Lynx-2 or Micro Lynx is connected correctly the CONTROL LED on the front panel of the AI-2 should be illuminated, to indicate that valid communication is occurring between the units. If the LED does not light (no communications) or is flashing (communication taking place, but with errors), then recheck the cable connections.

  • Page 25: Time Code Chase Interface

    The AI-2 thereby ensures that ADAT tape recorders can be integrated into a system when only a time code feed is available. The AI-2 reader has a wide input range and an adjustable flywheel option to cater for bad time code. The...

  • Page 26: External Midi Interfacing Midi Machine Control

    On the AI-2 front panel, the LTC LED will illuminate when valid time code is being received at the rear panel reader input. If the LED does not light or is flickering then check the time code cable or the output level of the time code source.

  • Page 27: Digital Transfer With The Ai-1

    The AI-1 should be installed at the end of the ADAT chain after the last ADAT transport. Connect a standard Alesis sync cable from the AI-2 SYNC OUT to the SYNC IN connector of the first ADAT transport, connect further ADAT transports sync in to sync out, in the normal manner.
  • Page 28 DIGITAL TRANSFER WITH THE AI-1 ALESIS AI-2 REFERENCE ALESIS CORPORATION, LOS ANGELES RDR IN W/C IN VID IN EDITOR POWER CONFIG TimeLine Vista, Inc. MANUFACTURED BY MADE IN USA CAUTION: TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

  • Page 29: Chapter 4: Getting Started

    CHAPTER 4: GETTING STARTED 4.0 POWER ON PROCEDURE Each time the AI-2 is powered up it runs through a series of initial- ization tests and displays the current configuration. The power on routine tests all front panel for two seconds and then runs through the following display sequence where the AI-2 configuration is displayed in approximately one second steps.

  • Page 30: Adat Id Numbers

    ID numbers as necessary. In a multiple ADAT system power must be applied to all ADATs. If an ADAT in the middle of the chain is turned off, then the AI-2 can not communicate with the transports connected after it. If a transport is not required in the system then simply eject the tape to take the machine offline.

  • Page 31: A Time Code And Sample Rates

    On initialization the default AI-2 control mode is set to auto. The AI-2 will check the control ports for communication and switch accordingly, if no communication is detected then the AI-2 will switch to reader chase mode.

  • Page 32: Setting The System Reference

    From this it can be seen that when either the sample rate or frame rate is changed, the sample rate ratio and therefore the tape time code position will change. As an example, if the AI-2 sample rate is altered to 44.100 KHz at 30 fps then the sample rate ratio becomes...

  • Page 33: Setting An Offset

    To set an offset from cue times stored on tape, set use times to on in the AI-2 Cue menu and then select a cue number, the offset will be calculated by subtracting the ADAT Tape time from the Cue start time.

  • Page 34: Trim An Offset

    ADAT tape header. Each cue has a name, a start time and a tape time. AI-2 cues are the same as BRC songs and the AI-2 start time is referred to as the SMPTE start offset in BRC documentation.

  • Page 35: Customizing The Setup

    Tape start times, this allows offsets to be automatically recalled at a future date. The information is saved in BRC format, so it can be read by either another AI-2 or the BRC. At the end of a session press the AI-2 front panel SAVE key, followed by STORE to confirm the save command.

  • Page 36: Chapter 5: Operational Features

    The AI-2 has four modes of operation, Normal, Set/Hold, Command and Setup. These modes are described in detail in this section. The AI-2 will usually be used in Normal mode. Set/Hold mode is used to modify and transfer times between registers. Command mode is used for data read and save operations and Setup mode is used to configure or modify the AI-2 operating parameters.
  • Page 37 Alesis documentation as song SMPTE Start Offset. The cue start time is used with the tape start time to calculate the AI-2 ADAT offset time. The cue start time is a high resolution time code number, which includes subframes.
  • Page 38 0 0 : 0 0 : 0 0 : 0 0 The AI-2 has a comprehensive error message and warning display system which is used to inform the user of changes that affect AI-2 operation. The AI-2 will prompt or warn of setup changes, such as selection of a new sample rate or change code type change and, physical changes such as loss of reference source.

  • Page 39: Set/Hold Mode

    STORE or press and hold the SET/HOLD key to exit Set/Hold mode. The SET/HOLD key is also used in combination with the STORE key to capture a value to the offset register. The AI-2 automatically calculates the difference between the ADAT position and the time...

  • Page 40: Command Mode

    STORE key as a loss of valuable information could occur. 5.3B Save To Tape Writes AI-2 data to the ADAT tape header. This command must be confirmed by pressing the STORE key as a loss of information could occur. If performed after a clear header, writes only SMPTE...

  • Page 41: C Read Tape

    Reads data from the first ADAT tape header. This command must be confirmed by pressing the STORE key as a loss of information could occur. The AI-2 reads and stores every piece of data in the ADAT tape header, even information that the AI-2 does not require.
  • Page 42 manual. In Setup mode, the function of the front panel keys changes, as indicated by the gray italic legends to MENU, LAST, NEXT, DOWN and UP. The SETUP key toggles in and out of Setup mode, which can be entered at any time. Press the SETUP key to enter Setup mode and press the key again to exit Setup mode and return to the normal display.

  • Page 43: Saving To Tape

    AI-2 for special or unusual applications. The default control type is auto, this causes the AI-2 to scan the control inputs for a connected control device. The AI-2 speed reference is then set depending on the type of controller detected.

  • Page 44: Longitudinal Time Code (Ltc)

    ADAT tape time minus the AI-2 offset. For example, if the ADAT time is 30 minutes and the offset is minus 1 hour then the AI-2 time code output would be 1 hour, 30 minutes, calculated as follows: (00:30:00:00) - (-1:00:00:00) = (01:30:00:00) From this calculation, it should be noted that the negative one hour offset gives a positive time code output.

  • Page 45: Midi Time Code (Mtc)

    CAUTION: TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. 5.9 MIDI TIME CODE (MTC) The AI-2 generates MIDI Time Code which is available at the MIDI OUT connector in the control section of the AI-2 rear panel.

  • Page 46: System References

    5.11 SYSTEM REFERENCES The frame rate of the AI-2's internally generated time code, and the relationship between that rate and the digital audio sample rate, are determined by the selected reference source. Available reference sources are word clock, video sync, Lynx synchronizer frame refer- ence, time code and internal, which can be either fixed or variable.

  • Page 47: A External Word Clock Reference

    5.11C Video Reference The AI-2 sample rate and time code are referenced to a video sync signal present at the VID IN connector. When selected, the internal time code frame rate and the digital audio sample rate will be de- rived from this video signal.

  • Page 48: F Reader Input

    The AI-2 sample rate and time code are derived from a variable internal reference which is adjustable in one cent steps. The AI-2 displays the pitch variation in cents and an equivalent speed per- centage read out. The range available at 48 KHz is from +100 to -300 cents.

  • Page 49: Chapter 6: Features And Controls

    CHAPTER 6: FEATURES AND CONTROLS 6.0 FRONT PANEL The AI-2 front panel has a power switch, eight status LEDs, six function keys and a two row, sixteen character Liquid Crystal display (LCD) with an orange backlight. The status LEDs are used to give continual user feedback of the AI-2 operating state.
  • Page 50 When a new message is added to the AI-2 error stack, the NON STD LED will flash. The messages can be viewed by pressing the STORE key and each time the STORE key is pressed the next message in the stack is displayed. When all the messages have been read, the stack is cleared and the LED stops flashing.

  • Page 51: Display

    6.3 DISPLAY The AI-2 display is used to indicate status information such as sample rate and time code information, and in SETUP mode to enter AI-2 operational parameters. The display is also used to show context sensitive warning messages and system error messages.

  • Page 52: Front Panel Keys

    Also used with the SET/HOLD key to capture and load an offset in the AI-2. If held down on power up will cause the AI-2 to perform a RAM clear operation and reset to default parameters.

  • Page 53: B Setup Operation

    MENU In setup mode, the front panel keys are used to select and adjust AI-2 menu options and parameters that are arranged in a tree style menu structure. The MENU key is used to access the top level categories, the LAST and NEXT keys are used to step through submenus and the DOWN and UP keys used to select options or alter values.

  • Page 54: C Set/Hold Operation

    UP. Moves up one submenu option or value. • CLEAR = DOWN + UP. Press the DOWN and UP keys simul- taneously for 1/2 second. Used to reset or clear some AI-2 submenu options to the default setting or zero, prior to entering a new value.

  • Page 55: Setup Menus And Functions

    6.5 SETUP MENUS AND FUNCTIONS The AI-2 has a setup or configuration structure comprised of separate menus. The items in each menu are grouped by function. The following tables and descriptions explain the operation of each of the functions. The front panel MENU key is used to select a menu, the LAST and NEXT keys step through submenus and the DOWN and UP keys used to select options or modify values.

  • Page 56: B Commands Menu

    Abort, this is used to terminate a data transfer operation in progress. The special case, clear header, erases the tape header information in the AI-2 so that information read from a previous tape will not be inadvertantly stored to a new tape.

  • Page 57: C Control Menu

    AUTO, which automatically scans the control ports and switches to the active port when it detects valid communications. Use this menu to select a specific control source when the AI-2 is wired so that it can be used with more than one controller.

  • Page 58: D Cue Menu

    ADAT transports for longer than the available input time code. When using continuous, care should be taken to ensure that the time code source and the AI-2 are both connected to a common reference, such as video sync. Phase Mode. This allows control of the AI-2 lock mode in •...
  • Page 59 Name. The name of the current cue. Cue names are limited to • ten characters and are the same as BRC "song" names. There is no method of writing or editing cue names from the AI-2, a cue name will therefore only be displayed if it has been read from tape.

  • Page 60: E Midi Menu

    6.5E MIDI Menu The MIDI menu is used to control the MTC generator and select AI-2 data for MIDI SysEx dump. Midi information can be transferred bi-directionally from one AI-2 to another AI-2, the BRC or an external MIDI storage device.

  • Page 61: F Reference Menu

    6.5F Reference Menu The reference menu is used to select the system reference, code type and rate and the tape time output, generator modes. The AI-2 internal speed and rate computations are all determined by the options selected in this menu.
  • Page 63 Input. Used to select the ADAT system speed reference • source. The default reference selection is determined by the method of control selected in the control menu. If SONY editor is selected the reference will default to external video. If Lynx is selected the reference will default to Lynx and if time code chase is selected the reference will default to reader in.

  • Page 64: G Status Menu

    AI-2 system reference. If the option card is on then the AI-2 video input BNC is used as a video output and may be connected to the sync input of a VTR or other transport that needs to be reference to the ADAT system.
  • Page 65 All Safe. Used to put all ADAT tracks into safe. Any track • mapping configuration will be retained. Faster lock times can be achieved if the AI-2 is set to all safe, this of course is only possible if it is not intended to record on the ADAT transports. Description Default Use track mapping assignments.
  • Page 66 Single tracks, pairs of tracks or groups of four or eight can be selected. When using Da1-Da4 track enables from the editor the AI-2 automati- cally maps these to A1-A4 Map To. Used to select the track or groups of tracks that are •...

  • Page 67: Chapter 7: Advanced Features

    When digital input is selected the ADAT speed reference is derived from the optical digital bus which must be locked to the AI-2 for correct operation. See the AI-2 Applications section for information on digital audio transfer, also refer to the AI-1 Reference manual.

  • Page 68: B Time Code Number Differences

    960 samples which is 20 ms, at a sample rate of 48.000 KHz. To record, all safe must be off and the AI-2 does not make use of the ADAT track delay feature.

  • Page 69: B Brc Control Feed Through

    The AI-2 can be interfaced to external MIDI storage devices, the BRC, or another AI-2, for transferring setup information. This MIDI data can be used to set up the AI-2 menus. The read and save data transfer options are set in the commands menu and when saving selected data is specified in the MIDI menu.

  • Page 70: Rear Panel Configuration Dip Switches

    7.4 REAR PANEL CONFIGURATION DIP SWITCHES Switch 1. Is used to configure the AI-2 so that after a memory • clear the default settings will initialize for 25 frame operation. Once the AI-2 is configured the selected options will be retained in battery ram and used each time the unit is powered up.

  • Page 71: Ext Word Clock

    This range will be different when other sample rates are selected. To indicate when the ADATS are not running at normal play speed, the AI-2 will turn one of the pitch control LEDS on the front panel of the ADAT on. 7.7 GENERAL INFORMATION 7.7A Tape Header Information...

  • Page 72: C Assemble Mode

    ADATs. Individual machines in an ADAT chain can be taken "offline" by ejecting the ADAT tape. The AI-2 will detect when a tape is ejected and if necessary automatically reassign the master transport. Do not power down transports in the ADAT chain to take them offline, this will prevent communication with ADAT transports further down the chain.

  • Page 73: Chapter 8: Appendices

    CHAPTER 8: APPENDICES 8.0 APPENDIX 1: SPECIFICATIONS 8.0A Operating Codes SMPTE (30 fps NDF) SMPTE (29.97 fps NDF) SMPTE Drop Frame (30 fps DF) SMPTE Drop Frame (29.97 fps DF) EBU (25 fps) Film Code (24 fps) Generator Output Signal Output Level Output Impedance Signal Rise Time Time Code Stability...

  • Page 74: D Adat Synchronizer

    8.0D ADAT Synchronizer Lock Time User Adjustment 8.0E Control Editor Interfaces Synchronizer Interface MIDI Interface 8.0F Front Panel The front panel has the following features: Display Selection Keys LED Status Indicators 8.0G Electrical Mains Input Power Requirement 2 to 3 seconds, nominal None Serial RS422, 38.4 Kbaud.

  • Page 75: H Interconnections

    8.0H Interconnections The connectors mounted on the rear of the AI-2 are as follows: POWER RDR IN EXT VID EXT W/C EDITOR MIDI IN MIDI OUT MIDI IN BRC MIDI OUT BRC MIDI THRU BRC LYNX-2/MICRO LYNX GEN OUT W/C OUT SYNC OUT 8.0I Option Cards...

  • Page 76: Appendix 2: Interface Information

    8.1 APPENDIX 2: INTERFACE INFORMATION 8.1A Sony Editor Constants If your editor does not recognize the SONY PCM-7030 machine ID, the editor machine constants should be set as follows: Constant Values (in hexadecimal) Item number PCM-7030 (30 Fr) Description of VTR Constant settings Item Setting Number...

  • Page 77: B Lynx Interface

    8.1B Lynx Interface The original Lynx module uses the LYNX-2/MICRO LYNX connec- tor to control the AI-2. A Lynx-2 ADAT cable is used to connect the AI-2 to the Lynx module, which must be fitted with a serial interface card. A video reference should be connected to the Lynx module and the AI-2.

  • Page 78: D External Word Clock

    8.1D External Word Clock The AI-2 will accept a 48k 5V TTL external word clock signal. The word clock should ideally be supplied by a high quality digital reference generator. A constant stable word clock reference is required for communication between the AI-2 and the ADAT transports.

  • Page 79: Appendix 3: Maintenance

    8.2B Maintenance The AI-2 is a solid state device that will give a life time of service with no maintenance. To keep the AI-2 looking as good as new, periodically clean the front panel.

  • Page 80: Appendix 4: Troubleshooting

    When the AI-2 control source is set to Auto it will automatically switch to reader chase operaton if editor or synchronizer communication is lost. If communication is...
  • Page 81 Make sure you have selected the correct time code rate and format on the AI-2. The ADAT transport front panel tape counter is designed to run in "real" time at a sample rate of 48 KHz.

  • Page 83: A Tape Status Messages

    • Tape Read Err. A tape read operation timed out or an error was encountered during the data transfer. The data in the AI-2 may be incorrect. • Tape Read Done. A successful ADAT tape read operation has been completed.

  • Page 84: B System Status Messages

    ADAT Unavailable. A tape operation has been requested and the ADAT transport is not available. • ADAT Version Err. The AI-2 has detected a version of ADAT software that is earlier than V3.05. This does not prevent operation, but synchronization performance may not be as good as it could be.
  • Page 85 Reh Not Locked. A rehearse command was issued to the ADAT machine chain before all ADAT transports were locked. • S/R Out of Range. The word clock signal connected to the AI-2 has exceeded the ADAT range. • S/R Changed. The AI-2 sample rate has changed.

  • Page 86: C Warnings

    • System Message. System message, followed by error message, warning, condition or number. • PLL Lost Lock. The AI-2 internal hardware phase lock loop has lost lock. • Video = NTSC. Video sync source detected is NTSC. • Video = PAL. Video sync source detected is PAL.

  • Page 87: Glossary

    8.4 GLOSSARY 24. '24' refers to both the film-standard speed and code type. 25. '25' refers to both the EBU/PAL speed and code type. 29.97. '29.97' refers to a SMPTE frame rate only, in frames-per- second. (See Drop Frame) 30. '30' refers to SMPTE frame rate, in frames-per-second. (See Drop Frame and Non drop Frame Address.
  • Page 88 Control Track. A synchronizing signal on the edge of a tape, which provides a reference for tracking control and tape speed. Digital Audio. A means of storing and transmitting sound using binary digits to replicate the audio waveforms. Display. Numeric display. Time Code/Message Display. Drop Frame.
  • Page 89 musical pitch and rhythm information, synthesizer performance parameters, song position markers, stop/start/continue commands for sequencers and computers, and synchronizing data called MIDI Clock, which is based on 24 pulses per quarter-note. MIDI is frequently used with SMPTE for sync-to-tape functions. MIDI is transmitted between microprocessors at 32.125 KBits per second.
  • Page 90 Resolving. A technique for regulating the play speed of a tape machine by matching the rate of pulses recorded on tape with a pulse rate from another stable source or a master tape machine. Sequencer. A device that can record performance data for synthe- sizers and other electronic instruments and then, on playback, pass that data on to the instruments so that they'll play what has been recorded.
  • Page 91 Toggle. To toggle is to consecutively press a key to enable or disable a feature. Type. See Time Code Type. Video Sync. A reference video signal generated by an extremely stable source. This signal is used to control the speed of video machines, digital audio machines and is used as a timing reference to ensure accurate synchronization.

  • Page 92: Fcc Notice

    8.5 FCC NOTICE This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide a reasonable protection against harmful interference when the equipment is operated in a commercial environment.

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