The Mission Engineering SP-1 Expression Pedal doubles up on functionality to offer an expressive control parameter built with premium appointments and boutique construction. Sporting a single input and two outputs, one for the expression and one for the switch to turn the pedal on/off, the SP-1 also works with digital effects and MIDI controllers to offer an unprecedented degree of control over your modern rig. What's more, opt for the SP-1R model to add a reverse polarity option on the pedal for even more functionality.