The PEEP Photo Eye Expression Pedal from Devi Ever lets you create special effects with your expression pedals. PEEP lets you control your expression pedal using photo eye technology. Simply plug in PEEP pedal in the signal chain with your expression pedal using standard instrument cables (stereo or mono depending on the situation) and place your feet or hand in the light beam to control the effect. Experiment by tweaking the pedal's controls to get the most out of the PEEP. For instant, you can use PEEP to control the sweep, rate, depth of a flanger. The PEEP works with many variety of expression pedal inputs. (Graphics may vary).