Grove Audio GMS-742a MIDI Preliminary Operation Manual Download Page 6

Copyright 2022 – Grove Audio LLC 

All rights reserved 

 

INTERNAL GATE CONNECTIONS 

There are four internal gate output connections that can be used as gates or triggers depending on the 
current operating mode setting. This picture shows their location: 

 

 

As an example of the use of these outputs, in the four independent channel with common gate and trigger 
mode, these outputs could be used to gate each voice through a VCA corresponding to it. Then the VCA 
outputs could be mixed and fed through a common VCA controlled by an envelope generator gated and 
triggered by the common gate and trigger outputs on the front panel. 

RUN/STOP REALTIME MESSAGES AND MIDI NOTE CONTROL 

An external control line on the ring of the MIDI CLK connector supplies a 0-5 V pulse or level waveform 
that can be used to gate an external clock or sequencer. The line can be set by programmable 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 or pulse 
depending on the needs of the controlled device. By using this line and the MIDI clock signal on the tip of 
the same connector, the external device can be synchronized with software sequencers. 

When using the MIDI note command to control the external control line, the internal logic will only respond 
to MIDI note messages sent on the MIDI channel which is one channel above the highest MIDI channel 
used by the current mode. For example, if Mode 1 is selected, the module responds to MIDI channels one 
and two to produce the CV and velocity signals and to MIDI channel 2 channels higher than the value set 
on the front panel MIDI channel selector switch for the RUN/STOP note commands. If mode 5 is selected, 
the RUN/STOP note commands should be sent on a MIDI channel 4 channels higher than the value set 
on the front panel MIDI channel selector switch. 

 

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...

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