I use BiaB to vary my arrangement when building wav files. I pick single tracks ie. piano, organ and any instrument that I don't master, (read: most ) and I create midi files, which I then bring into Sonar and complete the song with a mixture of midi, live, wav/acid drum and/or bass loops.

The end result is a backing track that superseeds any GM or XG midifile as I use plug-ins for the midi stuff.
BiaB is great tool for this, as it is a great practice tool as well. Vs 2006 is much improved, and for anyone saying it's cheesy you ought to listen to the latest style disks. They are fab!

Roy-Andrè
www.royandre.no