not exactly sure what you are trying to do but have you tried RealBand? Once you have the tracks in BIAB, save the file then open in RB. you can edit/add fx/ regenerate a few bars or a long phrase etc but the changes are 'undoable'. plus you can duplicate a track. leave the original as it is and play around with the new track to your heart's content without losing the original.

there are some things you can't do in RB (i'm sure someone will list them) but RB does have the advantage of being a little more obviously transparent (at least I think so) than BIAB.