Rare and discontinued vintage 1980s envelope filter/auto-wah pedal used by guitarists like Kevin shields from my bloody Valentine and bassists like flea Alex Gunia and Tom Misch seeking expressive, touch-sensitive filter sweeps without a physical wah pedal.

This pedal works great and is legendary for its

Analog Warmth: It uses an analog voltage-controlled filter (VCF) and operational transconductance amplifier (OTA) technology for a fluid, warm, and vocal-like sweep.

Dynamic Control: It features unique Up and Down envelope modes that react dynamically to your picking attack.Manual Mode: You can plug in an expression pedal (like a Roland EV-5) to use it as a standard, stationary manual wah or foot-controlled filter.

Deep Shaping: Unlike basic auto-wahs, it includes dedicated Cutoff Frequency and Q (resonance) knobs to precisely tailor the width and center of the filter peak.