Need access to overdrive and distortion, but don't want two separate pedals to achieve this? The OS-2 Overdrive/Distortion is a combination of legendary Boss Distortion and Overdrive pedals, with the three signature knobs along with a unique 'Color' knob which allows you to choose between distortion and overdrive, or blend the two for the best of both worlds.
 
True bypass. No box.
 
Controls
Level knob
Tone knob
Drive knob
Color knob