I"m new to working with loops. So, say you want to write a blues piece. I start by getting a nice loop of blues drums. So far so good. Next, I find a loop for bread & butter bass and that's when my troubles start. How do I make the loop to play in C, then switch to F, G, etc.? Is loop-based composition meant to be to put together what's in the library? Thanks for your help changing the paradigm.