The Line 6 M13 Stompbox Modeler is an All-in-One pedal board, which contains a plethora of stompbox sounds plus a full-featured looper. With its heavy-duty heavy metal construction, the M13 can handle abuse on the road. Up to four sounds can be used simultaneously with knobs for real-time tweaking of each sound. Loop phrases up to 28 seconds with Play/Stop, Half-Speed, Reverse and Undo functions. The 12 footswitches can be used for saving up to twelve scenes (setups) for all of your music scenarios. Scenes can be backed up or recalled via the MIDI I/O. The integrated chromatic tuner makes the M13 your complete stompbox solution.