I am in same situation here.

But i would like to use Auto Channel just for fast playing different tracks (A4, MM) without the need to switch to a correct Midi channel.

But, does the use of a specific channel activated also on OT work well?

I mean: you set the keyboard to transmit Midi ch.2 and OT is in MIDI mode with track 2 assigned to ch.2.

So i expect that OT transmits on OUT port for ch.2, right?
Does anything change if i leave the MIDI mode on OT?