My video is super-long, so I totally understand. About this:

"From watching your video at 13:14, I think you expected BiaB to automatically create the song, without entering any chords."

The thing is, the chords are in the score and should be in the MIDI file.

I "import" the midi file and BiaB just plays the midi file along with whatever happens to be selected within BiaB -- which is nuts, because then BiaB is playing two different songs at the same time. If you import an audio file -- BiaB also just plays that audio file at the same time as well.

A few years back, I think I did a "chord analysis" of an audio file with BiaB and that seemed to give BiaB at least some of the info about the song I'd imported.

It seems like BiaB should be able to understand the chords in a Midi file...along with the tempo map in the midi file.

But for now -- it's chaos! Madness!! :-)