BIAB has a feature called conductor that vastly improves its play-ability live. Well I agree that most users that rely on it tend to create mp3's they use when performing there are many who are using it successfully to play live while playing melody on other instruments. If you go to the forums at pgmusic you will find hundreds of users that use it in all different ways. It diffently not as spontaneous as a good arranger but with effort will almost always produce better results.