Two classic distortion/overdrive circuits are combined into one pedal; Swap tone controls and/or distortion sections to create new sounds. By mixing the SD Overdrive and RT Distortion, you can create two unique Hybrid Distortions.; Silent Buffered Bypass or True Bypass - hold footswitch for one second to change; Professionally Engineered and Expertly Manufactured Pro Audio Gear - sounds developed in the Keeley tone lab and in the field, then built entirely in our factory.