I don't know if you solved your problem? If not, try listening to each of the .wav files and see if they sound OK. If no other tracks are green or yellow, nothing else should be playing except those performance tracks (orange). What happens when you mute all parts but one? Does it sound OK?

Try another song and see if the problem persists. It could be a corrupted BIAB file although not likely. And if all else fails, Opt|Return to factory settings may fix it.