I've rendered it (and others) both to MIDI and to wav. Both work fine, including the waveform. Changing audio drivers just locked up the program.

In all honesty, I'm pretty taken with the ability to just drag and drop my tracks into Reaper, which is my DAW of choice for both music and voiceover production. Previously, I had been exporting the file to MIDI, separating tracks, then importing them all to Reaper, then loading instrument software so Reaper could play the tracks...

More work than I wanted. Now all that is short-circuited, and since the wav forms look great, despite how they play in BIAB, a good bit of my anxiety is relieved. I'd still like to know if I can fix the BIAB playback, though...