The dynamics can be changed in your DAW with automated vol or gain changes (assuming your DAW can do that).
What BIAB can't do yet (as FD has brought up before) is play a solo based on melody although sometimes it can by accident.
Usually I stitch different parts of that together in my DAW to get the best I can.

Vic

It's never too late? Yes it is, so do it now.

If, given time, a monkey can write the complete works of Shakespeare maybe there's hope for me.

http://store.cdbaby.com/cd/vicarnold2

http://www.soundclick.com/vicarnold

http://soundcloud.com/vic-arnold