Rocktron MIDI Xchange - Manual (Page 22)

CC17 Port - This controller port is the default volume controller
for all Rocktron products. Thus, all you need to do to control the
volume of each preset is plug an expression pedal into this port
and it will control the volume on all Rocktron products.
CC7 Port - This controller port is the default volume controller for
most non-Rocktron products.
NOTE:
The use of these controllers numbers are not exclusive. By
programing the receiving units (Rocktron processors or other non-
Rocktron processors) controller assignments you could assign
controller 17 or 7 to control various different parameters.
For example you can assign either controller to control the PITCH
parameter in a PITCH SHIFTER to create a whammy effect.
SETTING MIDI CHANNEL
MIDI Channel selection allows you to select the channel that the
MIDI XChange transmits MIDI information on. In most normal
operating modes you will want to have selected MIDI channel 1.
In this case your receiving MIDI device would have to be set to
Receive Channel 1 or OMNI
To change the MIDI Channel follow these instructions:
1) Turn MIDI XChange On