Guitar Pedal X on Twitter: "MXR's New Poly Blue Octave 4-Voice-Octaver, Modulator and Fuzz is a major evolution of their Legendary Blue Box Pedal - https://t.co/wDPttEdOxk #mxr #mxrpolyblueoctave #polyblueoctave #octavepedal #modulationpedal #fuzzpedal #