"I would either like RealBand for Mac, or more features in BIAB to allow me to freeze performances for certain bars and not for others. It's very frustrating to lose a great performance because you decided you wanted to add some new chords or even just to change a single chord.

Doing it the hard way, by exporting several different versions of the song into my favorite DAW and then COMP-ing all the tracks is really a tedious job."

Spot on, says it all, hope it's heard.
ReaTrak Integrate Biab & Plugin in Reaper
Why Worry (all BB).mp3