Re: Would this work?
I'm confused.
I know an A/B box can go two directions - one source in A, the other in B, Output to amp, or one in the middle and A out to one amp and B out to another amp/mixer/etc, but I can't figure out what you're asking.
The RC50 goes into "A", the acoustic DI goes into "B", and then what?
I certainly wouldn't recommend running an amp into the A/B box, as you seem to be saying.