I'm having the exact same trouble as the OP. Record a loop, hit "play once", and then use that as a one-time backing. So far so good. But later if you want to use that loop again, and hit "play once", what you've already played over that loop has been recorded onto the loop even though overdub was set to "out" during the first instance of playing. In fact, the looper continues to act as if overdub is engaged (even though it's not), and continues recording whatever you play onto the loop. Anyway to stop this weird behavior?