Hi!
I got a similar problem with my m5.
In my setup I use two mono ways. One leads to my amp and the other to a DI-box (its an Accoustic Simulator signal).
Both ways loops through the m5, because I use different effects at the two lines.
As you imagine, I got a lot of problems with all the Stereo Thru/Stereo Effects. Unfortunately I can't change the output settings. So the MIDI Controlls are my last hope. But I really have no experiences with MIDI.
Is it possible that the MIDI output of the m5 could control another gear, which set the A respectively B to bypass? Does such reciever exist?
Thanks for any help!