I have owned BIAB & Jammer for years. I played in many duo's (guitar & keyboards) and also by myself (guitar & backing tracks). I used these programs to make backing tracks of covers I did. 
Much easier than the hours and hours of sequencing I use to do.
 
I did tend to use BIAB much more. The newer versions let you customize the hell out of the interface and save it.

Wow 10 year old thread, 
I wonder how much these products have progressed? 
I think I have BIAB somewhere. Ya, it didn't seem to have any of the styles of music I play and the drum rolls drove me nuts. Sounded like a mall organ. But still fun to play along with.