The EP-1 is compatible with a large range of digital amps, effects units, MIDI controllers, and stomp boxes, and can be used anywhere you would use a Roland EV-5, M-Audio EXP, Boss FV500, or similar pedal. Spring load will always return the pedal to heel down; this is great for players who are looking to recreate the feel of a spring loaded wah pedal, or when using the pedal with an auto on/off detection such as the Fractal Audio Axe-Fx auto-engage feature.