This analog envelope filter pedal is one of the greats. The Mu-Tron III allows for low-pass, bandpass, and high-pass filter responses. Produces a glorious array of funky bass tones. See demo of sounds here (not me and not this Mu-Tron): Good condition and fully functional. Includes PS-1 power supply. Does not include original box. Lots of little nicks in the metal case. Faceplate paint is really good with only minor nicks. Original pin holding battery compartment cover is there, but seems to fall out. Power supply faceplate has a small dent. Will ship to continental US. Buyer pays shipping and insurance. Not interested in any kinds of trades.