With the Boss RC-20XL Loop Station loops and riffs can be stacked repeatedly until the entire massive 16 minutes of recording space is full. Never before has it been so easy to create a large one-person-band sound in real time. Save up to 11 loops at a time. Undo function makes it easy to create perfect loops. Built-in auto quantize for simple and accurate loop timing. Change loop tempo without changing pitch. Footswitchable loop select with optional FS-6 footswitch..