Hard to find, and packed full of possibilities. This 1987 gem from Boss features 5 distortion type modes: overdrive I, II, III, distortion & Fuzz. Drive level, 4 band equalizer and output level. Rear panel has standard 1/4" input & output along with an RCA connector output. Input for a foot switch and is also capable of powering other 9v effects. Tones use the same circuit as the original Boss series effects pedals