thanks to all for the replies, very helpful.

I tried the system on a live duo gig on Tue night with reasonable, but not perfect, results.

Some updated and now more informed comments.

I get the "linear" arrangement idea, and alternately, the use of into's, repeats and even endings. The linear way was the only way I could get a solo section into the middle of a tune. So I did:
intro - chorus x2 - 32 bar solo section with different chords than the chorus - chorus x2 - ending

I will have to try and understand generate .. not sure I get that just yet.

I did end up just doing my own arrangements and not copying or editing existing ones. That ended up being a much easier and faster way to go.

Also, playing with the "machine" was interesting because you have to play to it, rather than having a band play together. It seems to be a fine matter of carefully laying out the song form and then also being able to hear it well enough through whatever PA you have running (I clearly need some work on volume/balance).

I bumped into the Conductor tool, and I feel I should figure that tool out, because it seems as if it could be used to control the song flow in a live situation a bit better than the laotop keyboard I used on Tue night.

Can anyone talk to me about how you control BIAB in live playing situations. I am a bass player, so I need both hands on the axe while playing .. at least some people think so ;=)