Up for sale, a 1979 MXR Dyna Comp in excellent condition and in perfect working order, complete with the original box and operation manual. An early block logo iteration of this classic USA-made compressor; the Dyna Comp can tighten up your signal, add rich sustain, or create a distinct percussive click. Featuring simple Output and Sensitivity controls, this pedal is powered by an internal 9V battery. Box and papers.