The EarthQuaker Devices Pitch Bay generates polyphonic harmonies and distortions; it's a pitch shifter, harmonizer, and dirt-infuser all in one small chassis. Two voices of polyphonic pitch shifting exist one above and below the root, and each voice can be individually adjusted anywhere from 1 semitone to an entire octave around the root. Mix controls for each voice give you the power to blend each one of them, as well as the root note, into your sound as much as you want, and an input gain can throw in a little (or a lot) of distortion.