Yeah. Or like, a loop that plays continuously and has style parameters exposed you can tweak with a controller like a Midi Fighter Twister and get feedback from in real-time. Then you could do something akin to DJ/live production by having two of these going in sync with each other into a mixer. (Tweak params of the cue track until you like it, transition at a phrase point, repeat).
Yesssss. Something I'd really like is some kind of virtual drummer pedal with an expression pedal (pedals?) so that it can be tweaked in real time.
One of the most fun things about jamming with other musicians is that things change with the ebb and flow of the band's energy. i always miss it when I'm just fooling around at home with a looper.