“The Compressor 20 has effects for “stretching” sounds and can add a surprising level of sustain without distortion. It can smooth out lead lines and provide a nice tight feel to rhythm guitar playing as well. The casing is rugged, being die cast aluminum and there are two controls, volume and intensity. The “volume” sets the overall effect output volume and “intensity” control adjusts the length of sustain.”
“Most likely from the late 70s and appears to be a clone of an Ibanez CP-830 but modified.”