wtaGood info, William... I do like BIAB when I want to quickly lay out chords measure by measure to try out songs I'm working on without doing many takes of guitar recording to get 3-4 minutes right. And it keeps perfect time, BPM can be changed with one click, etc. Sometimes I use it as a poor man's drum loop/machine. I lay out a song and use only the drum line (or bass and drum) from BIAB. It's less time consuming for me than playing with drum loops, filling in rolls at the right measures, etc. If I want to add or delete a measure, it's one click.Also, it's a great co-writing too. If two people both have BAIB, they can email BIAB files back and forth- exchanging edits, updates, ideas, additions, etc... One caution (from MY POV) regarding what William said... Many non-performers like myself are better off NOT over-arranging what we give to a producer-- dictating what he/she should do for the bass, keys and other lines unless you truly have the right experience for production and arrangement. Sometimes the best tracks came from working with demo producers with great vision who can take the basic "song" and make it shine based on some guidelines (e.g. rock, style X, country a la artist X) but not VERY specific details. This obviously varies from songwriter to songwriter and producer to producer.(If my producers had listened to ME, it would have been disasterous, LOL...) Casey Good points Casey. I can only speak for myself as a producer and colaborator, I'd much rather have a semi detailed demo then a really bad chicken picked piano bit or a out of tune poorly played guitar track with scatch vocals from songwritiers that don't play piano or guitar as I can get a closer feel for what the demo sender is hearing in their head. For me BIAB and the like are GREAT tools in the hands of someone whos taken the time to learn how to use it properly and is developing their understanding of music... hth, wta