Are your instrument tracks muted or volume down too far? Are those instrument tracks set to midi and frozen?
Not sure what you did but I don't think you accidentally deleted any RealTracks from the BIAB RealTracks folder.
Not sure if this will work but here's an idea;
Save your song. Hi-lite all the chords in the chord chart. Right click. Copy. Open a new song blank. Right click on the first bar. Paste. Set your tempo, repeats and style.
See if all your instruments play now.

There is also a preference setting that allows you to have more than one instance of BIAB open. There you can copy/paste side-by-side.


Does the noise in your head bother me ?