I finally contacted the support staff and got clued in to what I was doing wrong. I didn't fully understand how the bar settings work. Since my bossa tunes has intro bars, and my bar settings were starting on bar one (part of the into), the settings were not taking effect during the repeated body of the tune. Once I reset the bar settings starting from bar 10 (after the intro and the beginning bar of the repeating choruses) everything worked fine. I had to experiment a little to figure out how to start the settings from bar 10. One must simply click on that bar to activate it, then open bar settings. It's too bad the help files are not more clear about this. If I get time I'll do a little instructional video on this and put it up on YouTube. I'm sure there are others who would like to do that same thing I'm doing. For a guitarist a jazz trio is about the most demanding thing one can do. Learning to cover the harmonic duties as well as improvise, and then comp for a bass solo takes a lot of practice, and BIAB gives one the ability to do that practice in just about the closest way as playing with real musicians. BIAB has been hugely beneficial to my development as an improvising musician. Here's a link to a video I've done using BIAB backing track (including a bass solo by Neil Swainson) for a Charlie Byrd type jazz trio (classical guitar, bass & drums): http://youtu.be/mo5Y8D901Ig