Envelope Filters
Two narrow filters sweep your tones under control of the envelope, generating very unique vocal-like sounds. For bass and guitar.
Two separate filter sections can be used in serial or parallel with different tonal sweeps, which react individually or interactively. Phase control allows for further contouring.
Generates percussive punchy filter sweeps for a rhythmic groove and super-funky wah-like tones.
The Electro-Harmonix Enigma is a powerful and precise envelope filter fine-tuned for bass frequency response.
A smooth envelope filter with a funky wah-wah tone.
Switchable Boost and Filter modes allow for an unlimited supply of new auto-wah effects that drip with attitude.
Same design as the original Q-Tron but with extremely useful Effects Loop and an Attack Response Switch.
The Electro-Harmonix Riddle is a powerful and precise envelope filter fine-tuned for guitar frequency response.
Experience cascading sweeps and gorgeous, panoramic imaging through stereo outputs. Generate seductive stereo phase shifting at its finest.
The programmable Stereo Talking Machine, Vocal Formant Filter, presents creative vowel shaping that is controlled by the player's dynamics.
Energized by two Electro-Harmonix 12AX7 tubes, the Tube Zipper's patented moving filter tastefully adds controlled analog harmonics to your signal.
All-analog multi-effects processor featuring Phaser, Tremolo, Vibrato, and a Neo-modulated Wah.
Overview
Electro-Harmonix has been a modern leader in the classic envelope filter effect ever since the day the creator of the Mu-Tron and the creator of the Bassballs teamed up to produce the Q-Tron, now itself a classic, must-have effect pedal.

Known for their vowel-like liquid quality, envelope filters are devices that sweep the peak frequency of a filter by analyzing the amplitude of the notes the musician plays. The loudness and softness of the musician's playing alone controls the filter. It is an effect that is effortless for just about every guitarist.

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