Electro-Harmonix Nano Bass Big Muff Pi Fuzz / Distortion / Sustainer. The most compact Bass Big Muff Pi ever is packed with the ginormous Bass Big Muff sound! The huge Bass Big Muff sound now in a nano-sized package, with voicing inspired by the tank green Russian Big Muff and the classic Big Muff Pi layout of Sustain, Tone, and Volume controls. Controls for Volume, Tone, and Sustain let you sculpt your distortion and drive, while the Dry switch mixes your dry bass with the EHX Nano Bass Big Muff’s distortion. Product Highlights: Tailor your drive/distortion sound with Sustain, Tone, and Volume knobs. Features a Dry switch that mixes your dry bass, at unity level, with the Nano Bass Big Muff’s distortion. True bypass for maximum signal path integrity. Road worthy die-cast chassis. 9V battery included. Product Features: Vol Knob: Sets the output level of the distortion effect. Sustain Knob: Adjusts the amount of sustain and distortion. Tone Knob: Provides a range of sounds from high treble to deep bass. Dry Toggle Switch: When set to DRY mode, the original dry signal present at the input jack is mixed with the output of the distortion circuit. Amp Jack: 1/4" audio output. Input Jack: 1/4" audio input. Footswitch and Status LED: LED lights when the effect is active, and the footswitch toggles between effect and bypass modes. Product Specifications: Circuit: Analog. Bypass: True Bypass. Audio: Mono. Power Supply: 9V battery included (optional 9.6VDC-200mA power adapter not included). Dimensions (in): 4.5 x 2.75 x 2.1. Current Draw: 4mA. Year Released: 2014. UPC: 683274011516.