MXR Poly Blue Octave Effect PedalWith upgrades in every feature and brand new sounds to explore, MXR and the Poly Blue Octave brings MXR's classic octave effects to the next level. With masterful pitch shifting already in MXR's area of expertise, the Poly Blue Octave shows how much further the experience can go. The Poly Blue Octave begins with four separate controllable octave divisions one octave up, two octaves up, one octave down, and two octaves down. Already, the experience at