The SD-1 Super OverDrive pedal produces the warm, natural distortion of an overdriven tube amplifier while maintaining the subtle nuances of a players picking technique. The one of a kind asymmetric overdrive circuitry allows for that classic tube overdriven sound. This is one of Boss' more subtle and smooth overdrive pedals,  which is perfect for playing blues and rock. The SD-1 features level, tone and drive controls to give you a variety overdriven sounds. Order your Boss SD-1 Super OverDrive Pedal from Sam Ash Direct today with the security of our 45/60 day return/price protection policy, and be sure to take advantage of our fast, free shipping.