Mu-Tron Mutron III

This analog envelope filter pedal, first made in 1972, is one of the greats. Used by Jerry Garcia, Bootsy Collins, Stevie Wonder, and a whole host of talented musicians, the Mu-Tron III allows for low-pass, bandpass, and high-pass filter responses. Whatever instrument you choose to throw at the Mu-Tron III, it'll take and produce a glorious array of tones.