I transfer all BiaB MIDI and RT tracks to my DAW, Studio One Pro 5. From my DAW I use external synths, that way I can covert them to audio in the DAW, convert all MIDI track to audio, then mixdown all audio tracks to one, either a WAVE, MP3, or any other audio format. Doing things like this is much easier in a DAW then trying to use BiaB. YMMV

Note that in my DAW I do not have to convert MIDI tracks to audio tracks but I do it out of old habits.

When you are at the checkout line and they ask if you found everything say "Why, are you hiding stuff?"

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware