This has a looper in it. Special FX -15 Infinite Repeat 2 & a bit seconds, mono not really infinite, fades & dulls eventually (good for several minutes) midi syncs to the JamMan ,glitch free ,(a fraction of the jamtapped time). Can either add new material or play over the top, but the manual doesn't tell you how. Apart from this there's some excellent fx+reverbs of very high quality, but not much in the way of extreme sounds. Andy Butler.