The pxl-4 is a member of the joyo pxl series programmable pedals controllers - pxl4, pxl-live, pxl-pro. the pxl-8 is a very powerful pedal controller. It has 4 outputs. For musicians who own a lot of musical gear, the pxl-4 will be the perfect pedal controller to make life easier. The pedal can save up to 16 presets of combinations.