While creating SS-11 we were guided by the motto - minimum size with maximum functionality for full tube overdrive with the highest quality components. The SS-11 is brother to the SS-20, but designed to be different. While the SS-20 is the more aggressive "METAL" pedal, the SS-11 was intended and manufactured for that famous CLASSIC tube driven over saturated guitar tone that eveyone loves and craves. The SS-11B Modern version is designed to cover the sounds of today's high gain tube amplifiers. Offering more distortion than the SS-11A, the SS-11B is a rock-metal monster! The tone of the SS-11B (Modern) works perfectly for heavy riffing, drop tuned guitars, 7 strings, and screaming lead work.