Look up the conductor feature. It's an icon with a guy waving a baton, which of course, being somewhat illiterate when it comes to musicology, I have learned that a conductor is certainly not a musician , unless of course his one arm is broken and he can't play bluegrass. Despite those limitations, and the aforementioned generalization (which probably has something to do with being promoted within the military establishment), the arrival of a conductor at your computer inspired gig will allow you to repeat section and change the order on thtioe fly. If you really get fancy you can get a foot controller like the one Behringer sells and program the buttons to do the keystrokes.

John Conley
Musica est vita