Legendary fuzz with added features like a Bass Boost, Noise Gate, and adjustable Mids section for the most versatile Muff ever. Long revered for its sweet singing tone and violin-like sustain, the classic three-knob Electro-Harmonix Deluxe Big Muff Pi Fuzz Pedal has helped define the sound of rock guitar for over 50 years. Now, the team has added some extras for those who crave more sound shaping control. The EHX Deluxe Big Muff Pi delivers all the classic sounds of the original NYC Big Muff Pi, plus more. Added footswitchable Mids sections boosts or cuts an adjustable mids frequency for added definition or massive scooped tones. Add an optional expression pedal and turn the Deluxe Big Muff into an extreme fuzzed out wah. The Attack control preserves pick attack with an enhanced version of your dry signal while the Bass Boost adds rumble at higher tone settings. The Gate removes unwanted hiss for a more dynamic performance. This is the most versatile Big Muff ever. Switchable Bass Boost for added bottom when you want it. True bypass for maximum signal path integrity. Mids section features four controls so you can fine tune your midrange boost or cut with 9V battery included.Volume KnobWorks as master volume control for the entire pedal.Tone KnobProvides a range of sounds from high treble to deep bass.Sustain KnobAs in the original Big Muff Pi, adjusts the amount of sustain and distortion.Attack KnobVolume control for the Attack effect.Gate KnobTurning gate clockwise raises the gate threshold requiring greater input amplitude to open the noise gate, allowing your notes to be heard and your instrument to pass through.MIDS Level KnobWhen MIDS is engaged, the MIDS level knob either boosts or cuts up to plus or minus 10dB, at the frequency set by the frequency knob.Bass Boost or Normal SwitchWhen set to normal, the Big Muff circuit is identical to the NYC Big Muff. Flip the switch up to BASS BOOST and the volume level of bass frequencies through the Big Muff circuit increases.Mid Q Switch (High or Low)The Q switch sets the resonance or bandwidth of the Mids EQ.Mid Frequency KnobSets the center frequency of the MIDS EQ circuit ranging from 310Hz to 5.0 kHz.