Just a quick note on how to actually get the MIDI from BIAB to a working .MID file...

So I went to the BIAB Help and searched on MIDI and found a topic "MIDI File - Saving". It includes the following "menu command File | Make a Standard MIDI File or F6 key" neither of which seem to work!

Then I found "File/Save Special/Save Song as MIDI file" in the main menu and I tried that. I chose Type 1 and I got an empty file with chords but no MIDI information. I tried again with Type 0 but again I got an empty file.

Finally I remembered something someone here had posted (maybe Mario or Dan). So I clicked and dragged my piano track from the top bar to the tiny gray MID box. And, a few seconds later I was able to retrieve an actual working MIDI file from the DragDrop folder!

This is why I never really enjoy experimenting with BIAB! There are just too many empty rabbit holes! But I am happy to have figured out a way to get the MIDI so there's that!