I've been using a RC20XL for the last few years. The limits I've been facing are the inability for multiple tracks, to bring in and out at will to create a composition that doesn't merely add, but has multiple levels of density coming in and out.
I'm assuming that Sooper Looper can do this. In the upper left hand corner I see loop 1. I'm able to overdub and

undo and redo etc.... How do I create an entirely new loop, separate from overdubs? AND still have the other loop playing and audible.
j