Boss SD-1-4A 40th Anniversary Super Overdrive Pedal

BOSS 40th Anniversary SD-1 Super Overdrive Pedal Features: 40th-anniversary edition of BOSS popular overdrive pedal! 

Asymmetrical clipping circuit provides a harmonic-rich sound with a tubelike feel Ideal for warming up or adding grit to a clean or edge-of-breakup tube amplifier
A great way to add tightness and definition to a high-gain setup
Makes a stellar lead boost and stacks well with other dirt pedals
Straightforward 3-knob control layout