What I would like to be able is to define parts in BB, like intro, chorus, verse, bridge, end, and be able to select them with a foot switch.
On a live gig, I like to have guest so I'd like to able to loop more chorus, or chorus+verse than originally planned.

In short, I cannot know the exact sequence of part/sections I'll need that day.
That's why mp3 won't work.

Does that exists ?