Boss PS-6 Harmonist

Not just for producing great harmony guitar parts, the PS-6 features four intelligent pitch-shift effects: Harmony, Pitch Shifter, Detune, and Super Bend. Easily create two- or three-voice harmonies with selectable keys, major and minor. The harmony function is fast and simple to use, and supports a variety of interval patterns. The PS-6 also features high-quality pitch shifting, three-voice Detune capability, and Super Bend provides up to four octaves of extreme pitch bending. You can also control pitch with an optional expression pedal.