> BUT the BiaB track at the same tempo and at 6/8 does not match the others, thus making it useless.

Well yes, as I described above, the tempo the DAW is using is wrong for a triplet feel (compound) time signature and is 1.5x too fast,

You need a simple MIDI function that stretches midi, to change the tempo from 50 to 75 (for example), but not change the speed.
Does your DAW have a function like that?
You would need this function if you wanted to mix any n/4 time signature (tempo=50) with your DAW (6/8 simple, set to tempo = 75).

It sounds like the (new) option you’d want added to BiaB is “export the MIDI file stretched to 1.5x tempo , for compatibility with DAWS that don’t support triplet based compound time signatures”. Then a midi file exported from BiaB would be wrong, but wrong in the same way as the daw, and two wrongs would make a right. I’ll look into adding that!

Have Fun!
Peter Gannon
PG Music Inc.