I use a yorkville xs800 head, and I was experimenting with the effects loop, and just ran it back into itself with a patch cable. I’ve only tried it at low volumes, but it sounds really good, and almost like it is just stacking another of the same tone on itself. The amp has a wet dry blend knob for the effects return, and I was trying it with it at all the way to wet. It sounds really good, but I am wondering if there’s any reason I should not do this?