Envelope filter effect pedal for guitar and bass guitar. This pedal has two main sound settings, which are selected by a two way central switch. The Up is mainly suitable for guitars and the Down setting emphasizes bass frequencies making it the ideal setting for a good bass guitar sound. The Level pot controls the sensitivity of the envelope, Range controls the range of frequencies which are affected by the envelope. This pedal´s footswitch works in True Bypass and has a blue LED signal light. DOD 440 is made of light aluminum alloy and it´s powered by a 9V battery or a power adaptor, which is not included.