The Electro-Harmonix Bass Metaphors Compressor Pedal has a distortion design that melds carefully selected compression with bass-specific EQ. You get tonality structure for your bass with a rock solid foundation. The Bass Metaphors pedal's channel strip design makes for easy setup and deadly tone. 1/4" and XLR inputs and outputs let you go to your amp and directly to the board for recording. The dry knob lets you control how much dry signal is present at output. The compressor adds sustain and smoothes out the signal from your bass.