Rocktron MIDI Xchange - Manual (Page 24)

To select the MIDI Channel depress and release the RECALL
switch once. The display will immediately go back to the selecting
and recalling preset mode and a flashing number 1 will appear in
the window as shown below:
MIDI CHANNEL CONFIRMATION
If you want to confirm this simply turn off the MIDI XChange and
wait 10 seconds then turn it back on a again. The display will
indicate the current MIDI Channel.
At this point you may either press the RECALL switch to select
preset number 1 or use the UP or DOWN switches to scroll to the
desired preset.