Lately I've been really getting into solo bass and I'm experimenting alot with layering in order to be able to play complex musical compositions on a bass in a live enviromnent. Right now I have a RC-20XL Loop Station (that I admittedly got because a fellow bassist I admire was using a Boomerang to great effect, and everything I could tell at the time said that this was twice the machine at half the price). And it's very novel to work with - I can do alot of cool things. But What I really want is a way to play through a whole song, with 3 or 4 different parts, and interchange between them on the fly. So for example there might be one line for the verse, a different for the chorus, the bridge might do something else, and I need a way of being able to play a line, kick it into loop mode, and then move on to another line when the next part comes up. As you can imagine, quite a tall order for the RC-20XL, which only really lets me play one loop at a time and then layer on top of it. Does the RC-50 have this functionality, or could it be done using several RC-20's, or is there another unit that would be better suited to what im trying to do? Im not really interested in pre-recorded stuff, there are computer-based programs that can do that far better than any looper ever could, but rather a live performance tool that allows me to layer parts on the fly to create an entire song, not juts a single looped phrase.