Octaves? Check. Modulation? Check. Fuzz? Check. MXR has a long history when it comes to octave pedals, but the Poly Blue Octave really takes it up a notch. This potent pedal comes loaded with four knobs dedicated to mixing in its quartet of octave functions: one up, two up, one down, two down. The default setting is designed for a polyphonic mode, meaning that whole chords will sound just as supple as individual notes. As if that weren’t enough, MXR loaded the Poly Blue Octave with a modulation knob that has two distinct tones depending on whether you’re using poly or mono mode. If you’re looking for an amazingly versatile multi-effect octave pedal in a small, rugged form factor, then look no further than MXR’s Poly Blue Octave.