BOSS OC-5 Polyphonic Octave Pedal For Guitar And BassThe industry standard octave pedal, updated with enhanced features Newly developed tracking technology provides more accurate response and natural feel with no latency Vintage mode faithfully reproduces the mono sound of the original OC 2 Poly mode for chord playing; Range knob sets the note range where the effect is applied Lowest Range setting in Poly mode applies the octave effect to only the lowest note in a chord New octave up effect, available