I haven't used BiaB live, as I have sequenced up my own backing tracks using Reaper and soft-racks of virtual instruments (Reason and VSTs).

However, the principle is the same as what Danny C. is discussing. I do MOST of the solos myself, either via guitar, or sometimes I do a credible trombone or trumpet impersonation with my voice. Sometimes I'll see members of the audience do a double-take when they realize that "horn" is me. lol

Anyway, I DO have a little bit of solo piano work sequenced up during certain songs, just to trade off and break things up a little.

I'm an accomplished enough soloist to "carry" the evening, even for 4hr gigs, but that added spice of a piano helps keep things fresh.