What Pipeline says will work but you can even bypass that if you check the SuperMidi pianos to see if there is a suitable substitute for the 1602 RT.

If not, let's move on to your question for me.

.... Can I open the track i've fixed in BIAB? Yes.

I would repair the track in RB and export that audio track to my Desktop and then import that audio into Biab and move it to a Performance Track (Replace the RT Piano generated track) which frees up the Audio Track for you to record your Guitar.

You can also save the RB file as a Biab Sgu/Mgu file and open that file up a new Biab session with the repaired guitar track intact.

Any of the four different options detailed here should fix your issue with the bad chords. Even with that, you can also generate multiple tracks with the 1602 Rt's in Biab and mute/unmute to comp a track and export that as audio and the go through the import to Audio Track and move that Audio Track to a Performance Track.

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.