Thanks for all of the advice Rama. I think I am going to purchase the UnO firmware update (the Behringer firmware is very limiting), but before I do I just want to be sure of its functionality. I'm planning to play bass and keys through Mainstage (bass mostly) controlling patch changes with 10(previous) and 5(next), stompboxes with 1 through 4, possibly mute and some other miscellaneous functions with 6 through 8, volume with expression pedal B, and other expressions with expression pedal A. Does this sound feasible with the UnO firmware update?
Thanks!