A very handy Electro-harmonix Bass Preacher compressor and sustainer pedal for bass guitar. The Electro Harmonix Bass Preacher is a great and affordable bass compressor that will help you bring out the best in your bass tone. You can use the Bass Preacher to remove unwanted burpy fart sounds or dial in a wicked funky squashed tone. An Attack toggle switch changes the timing of the onset of compression and provides three selectable settings: Fast, Medium and Slow. It has input sensitivity ranges from -10 dBu to +2 dBu making it a perfect fit for both passive and active basses of varying output levels. Maximum gain reduction of 21 dB, with enough make-up gain to return your signal to full volume at maximum sustain (compression). An excellent little pedal, perfect for maintaining the perfect bass tone!