I have spent some time thinking and reading about this feature.
At the end I think that I will need a midi control sistem to send messages to the BB. The problem is that the midi controls are expensives, bigs, and It only solve part of my needs. I would like to have, in the future, a good looper sync system.
So… i had bought a raspberry pi and I had started to designed a new project.
My idea is to have a rapsberry with a midi and audio interface with some software additions. Basically, I would like to have a software looper in the rapsberry and, then, sync the looper and the BB with a midi clock.
I would like to change between looper/BB parts song with a simple pedal click. And each part song could have a bpm time definition in the raspberry time.
At this time I started to test software parts and I think that it could be possible. I need some extra hardware… but I believe that in a short time I can have a beta.