A big +1 on this idea.

I've been a bit frustrated lately, hoping there could be an easy way to add Midi parts in BIAB to a mostly RT song.

While the RTs are great, sometimes you're needing a different kind of part that you remember from the Midi styles. A midi part picker, similar to the RT and RD picker would be fantastic, especially if there were a way to preview it like we can now preview the RTs.

I'm sure this would require a massive amount of work for PG, but it would be a great asset to BIAB.

John