I recently bought BIAB specifically to create backing tracks to use live.

I save the songs as mp3 and load them on my ipad through iTunes. It helps having a mac pc but it is possible to use Windows to do this.

I use Onsong on my ipad to trigger the backing tracks which sync with the chord charts on Onsong.

I use a Line 6 Sonic Port from my ipad to a digital mixer, then to the PA.

This works really well and as I become more proficient in using BIAB I think I will get more refined backing tracks. The sounds in the basic BIAB that I have are good enough to begin with.