Grove Audio GMS-742a MIDI Preliminary Operation Manual Download Page 3

Copyright 2022 – Grove Audio LLC 

All rights reserved 

 

OPERATING MODE TABLE

 

Operating mode is selected by a front panel 16 position rotary switch.  

MODE

 

FUNCTION

 

1

 

2 Ch. Independent 

Note CV, Velocity CV, Gate, Trigger 

Successive MIDI Channels

 

2

 

2 Ch. Polyphonic 

Note CV, Velocity CV, Gate, Trigger 

Common MIDI Channel

 

3

 

4 Ch. Polyphonic 

Note CV, Gate 

Common MIDI Channel

 

4 Ch. Polyphonic 

Note CV, Common Gate 

Common MIDI Channel 

5

 

4 Ch. Independent 

Note CV, Gate 

Succesive MIDI Channels

 

6

 

2 Ch. Independent - Legato On 

Note CV, Velocity CV, Gate, Trigger 

Successive MIDI Channels

 

7

 

1 Ch. with Pitchbend, Mod Wheel 

Note CV, Velocity CV, Pitchbend CV, Mod Wheel CV, Gate, Trigger

 

1 Ch., Legato On with Pitchbend, Mod Wheel 

Note CV, Velocity CV, Pitchbend CV, Mod Wheel CV, Gate, Trigger 

9

 

2 Ch. Independent - Split Keyboard 

Ch. 1 (C0-B1) Note CV, Gate; Ch. 2 (C2-C5) Note CV, Gate 

Common MIDI Channel

 

10

 

2 Ch. Independent, Legato On - Split Keyboard 

Ch. 1 (C0-B1) Note CV, Gate; Ch. 2 (C2-C5) Note CV, Gate 

Common MIDI Channel

 

15 

Channel Calibration Mode 

16

 

Test/Tuning 

Common Note CV and common Gate on all outputs 

Current MIDI Channel

 

MIDI CLOCK OUTPUT 

If the input MIDI stream contains the MIDI clock (24ppqn clock), the module can be used to output the 
clock to external devices, divided by a preset factor. The clock is output through the front panel MIDI CLK 
jack. This is a stereo jack with the clock appearing as a 0-5V square wave on the tip connection. On the 
ring of the jack is a run/stop signal which can be configured to use the MIDI run/stop/reset realtime 
commands or a note message controlled run/stop command. 

The division factor is controlled by the module programming grid Group 1. There is also a toggle bit to 
enable the MIDI clock note control. The factory default is a division ratio of 12 (1:8) which will give one 
clock per eighth note.  

 

 

 

Summary of Contents for GMS-742a MIDI

Page 1: ...Copyright 2022 Grove Audio LLC All rights reserved 1 GMS 742a MIDI to CV CONVERTER PRELIMINARY OPERATION MANUAL APRIL 17 2022 Grove Audio LLC Copyright 2022 All Rights Reserved...

Page 2: ...hannel will produce the voltage equivalant of the MIDI velocity value one gate channel will produce a gate signal for the duration of the MIDI note on to note off time and one gate channel will produc...

Page 3: ...Note CV Gate Ch 2 C2 C5 Note CV Gate Common MIDI Channel 10 2 Ch Independent Legato On Split Keyboard Ch 1 C0 B1 Note CV Gate Ch 2 C2 C5 Note CV Gate Common MIDI Channel 15 Channel Calibration Mode 1...

Page 4: ...roximately two seconds until the Gate 1 LED starts to flash This indicates that the module is in the programming mode By briefly pressing the toggle switch to the right and releasing it the program gr...

Page 5: ...ck div 6 Zero volts at C2 7 1 8 clock div default 7 Zero volts at C1 default Q104 mode 8 1 8 dotted clock div 8 Disable Pitchbend for mode 7 8 default 9 1 4 clock div 9 Enable Pitchbend for mode 7 8 1...

Page 6: ...le switch to be high from the time the RUN realtime message or MIDI note command is received until the STOP realtime message or MIDI note command is received The output can be set to be either a level...

Page 7: ...acy meter will work but a 5 digit DVM is preferred The current calibration points are between C3 and C5 The default values for these calibration points for the 5 Volt are 1 0000 Volts Calibration valu...

Page 8: ...h external controller An external keyboard controller can be routed to the converter module to perform calibration by using MIDIOX Open the OPTIONS MIDI Devices tab Click the name of the converter mod...

Page 9: ...ng calibration The module can store and recall up to 16 sets of calibration tables including zero and span calibration values for the 5 V 5V range The set of tables stored in the default location will...

Page 10: ...Connect a USB type A cable from the host computer and plug the miniB end of the cable into the USB connector on the module There may be some preliminary communication and installation of drivers Even...

Reviews: