Is there some way during a BIAB song playback to trigger a canned drum or bass break solo anywhere in the song with a pedal or something ?

How would one best do this ?

Or do you just have to program the whole song including written breaks at pre-designated spots and then just layout (I'm playing piano)during playback at those spots ?

I'd love the flexibility to randomly stop the song a la a conventional jazz trio wherever I desired, let the bass or drums take a solo, and then resume to take it out.

Bob