Awesome! Thank you so much Larry for taking the time to explain all that to me. This is exactly what I wanted to do! I re-did my previous setup to work you like described, and it all worked perfectly.

I guess my original instinct to not turn on the 'Force MIDI' option was good, but I had the bad luck to assign an instrument to part 1, which BiaB doesn't normally use. Thanks again for setting me straight on the proper way to set things up in BiaB!