Voodoo Lab Ground Control(Original Version 2) - Manual (Page 30)

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D I G I T A L M U S I C C O R P O R A T I O N
There are 121 different MIDI Continuous Controllers,
numbered 0 to 120. Each controller is like a slider or a knob; it
can transmit a "continuous" stream of values ranging from 0
(all the way off) to 128 (all the way on).
The Ground Control has inputs for two guitar volume pedals
which you can define to send any MIDI Continuous
Controllers you wish. The position of your pedal is converted
into a value from 0 to 127. Whenever the pedal is moved, the
Ground Control transmits a Continuous Controller message
with the new value.
Each MIDI device supports Continuous Controllers differently,
so you should consult the manual for that device to determine
which controller to use, and what parameters may be controlled
with it.