The Boss WP-20G Wave Processor and OC-20G Poly Octave represent a major breakthrough in guitar pedal technology. With their 13-pin GK Pickup inputs, these compact "GK Effect" Pedals can process each guitar string individually, yielding amazing synth-type effects (WP-20G) and polyphonic octave capabilities (OC-20G) far beyond any effects pedals in history. Category: Guitar Pitch Effects Brand: Boss |