Right Click Save Link\Target As Song 12-8 65bpm 4-4 43bpm.wav

In a new Biab set it to 4/4 43bpm 38bars mute or freeze all the Style tracks.
then File Import Audio > WAV
it should be set at 43bpm base tempo it was 43.33 to fit the 4 beat bars but Biab can't handle decimal tempos so the playrate was dropped to .992

The actual 12/8 tempo is 65bpm

With Micro chords this should give 12 chords per bar

I should be able to make up a UserTrack to test it out.

So there might be some way to get real time signatures to match DAW sessions ??