The MXR Poly Blue Octave pedal takes octave effects to new heights. With four dedicated knobs for octave blending and versatile polyphonic and mono modes, it offers a wide range of tonal possibilities. The built-in fuzz and modulation knob add further sonic versatility. This compact and rugged pedal is an excellent choice for musicians seeking a versatile octave pedal in a small form factor.MXR M306 Features:4 separate octave knobs that can be run simultaneously: 1 up, 2 up, 1 down, 2 downDry level control to mix in your regular signal with pitch-shifted tonesPolyphonic design means that chords will sound just as good as single notesMono switch offers a vintage and gritty analog-style soundBuilt-in fuzz that’s inspired by the MXR Blue BoxDual-modulation circuit that mimics a classic Leslie-style sound in poly mode; mono mode offers sounds inspired by the MXR Phase 90EXP jack to connect an outboard expression pedalTough metal housing with a true-bypass switchMXR M306 Specifications:Pedal Type: Octave, Pitch Shift, FuzzAnalog/Digital: DigitalEffects: One Octave Up/Down, Two Octave Up/Down, Fuzz, ModulationInputs: 1/4"Outputs: 1/4"Other I/O: 1/4" (expression/switch)True Bypass: YesPower Source: 9 V DC power supply (included)Power Usage: 265 mAHeight: 2.12"Width: 2.62"Depth: 4.37"Weight: 0.82 lbs MXR M306 Octave Guitar Effects Pedal, Poly Blue.