The boss ps 6 harmony effects pedal is the perfect tool for giving your sound extra depth and a beautifully rich texture offering four intelligent pitch effects for a versatile performance. Create everything from a classic octave pitch shift and detune to a beautiful three voice harmony and an extreme 4 octave pitch bend. Each mode features an array of tonal adjustments ensuring players can dial in the perfect sound for any situation. The addition of an exp input also allows players to externally control the pedals parameters with an expression pedal while the mono and stereo outputs provide a range of different setups. Offering bosss iconic combination of superior sound quality ease of use and powerful pitch effects the boss ps 6 harmony pedal is perfect for any pedalboard.