THEEEE BEST effects processer you can get is the zoom GFX707. It rules!!!! The sounds you can get are great. It has a 2 sec.loop function. It's very easy to operate and all the pre-set effects are adjustable plus it has a amp modler plus a dozen or so drum tracks to jam with. It,s great!!!! Everything you can do with this is at your feet and it has a built in expression pedal. I play a taylor 410 acoustic thru it and My sound is great!!!!!!!!!