Bernie, IMO BIAB works best in conjunction with a DAW. There is now a VST plug-in available that will let you drop tracks into your DAW of choice. It will also let you audition up to seven (I think it is) parts from any Realtrack and decide which one to use. I used to do this "by hand" by reloading the tracks and saving several that I would then cut and paste from to make a better sounding part. I haven't used the new plugin yet but it should make the workflow easier.

Bottom line-BIAB is great for adding parts to a composition that would be otherwise hard to do or even impossible if you don't play a certain instrument. For example, a keyboard player who wants guitar parts but doesn't play guitar.