I use the compressor all the time, but it doesn’t really work like a typical compressor - or at least a hardware comp which is what I’m used to. It does a pretty good job of tightening up the sound, but I mostly just use it as an effect when I want something to really hit. I’ve found the Attack and Release settings to be a little suspect sometimes (especially at how easily they make my particular samples distort), but I typically leave them closer to 127 than 0.
Just to clarify (I think they go up to 127, right?):
Attack 0 = Fast
Attack 127 = Slow
Release 0 = Slow
Release 127 = Fast
Are these correct? There’s no mention of this in the manual, just through using the comp, it seems this is how they function.