COSM modeling gives you the sound of 16 classic overdrive/distortion pedals plus 6 all-new tones, while deep-level controls let you shape your own sounds. Attack Shape and Heavy Octave knobs let you profoundly impact the effect. 4 user memories and line out with amp simulator that's also a headphone out. Amp control jack lets the OD-20 double as a footswitch for switching amp channels. BOSS 5-year warranty.

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