Noel:

Thanks for posting those detailed instructions of finding Patches in the piano roll mode. That will be helpful to people.

But I can confirm that the problem from the original post still exists for trying to make patch changes using "Select MIDI Instrument" >> "Select GM2 Patch"

By coincidence, yesterday I created a midi track using "Select Custom MIDI Style for this Track" -- and I chose a piano part from a midi style that I later wanted to change to Electric Piano.

BIAB created the midi track using Patch 1 (Acoustic Piano) and I was using the Roland TTS-1, which is GM2 compatible.

I then went to "Select MIDI Instrument" >> "Select GM2 Patch" and selected GM2 patch 6/2 EP Legend.

I regenerated the track but the original Acoustic Piano was playing.

I then went to "Select MIDI Instrument" >> "Select General Midi Patch" and chose patch 6 Electric Piano 2.

I regenerated again and the patch changed to one Electric Piano 2 patch I had chosen.

So "Select General Midi Patch" works, but the "Select GM2 Patch" does not.

It would be nice if BIAB development could fix that.

I am using BIAB 2021, Build 840

John