Changing MIDI Channels for T2

How do you change the MIDI operating channel on the T2 head? My manual only explains how to do this on the V2. I'm running 2 heads and one is set for channel 1 and the other for channel 2. I've tried running my pedal on the OMNI channel with no luck. I can get the heads to work in unison with the Randall pedal but I want to use my other MIDI controller pedal so I can include effects changes.

Thanks,
Greg