Bass-optimized envelope filter with Dry blend and FX loop for drive stacking.

76 octave fuzz with added multi-mode envelope filter section for synth-like textures.

Dual-envelope filter with extensive parameter control and independent high/low filters.

Envelope filter with harmonic density engine, LFO, 4 filter modes, CV patch bay, expression—400mA/9V, 124x99x61mm.

Mu-Tron-style optocoupler envelope filter with voltage doubler for extra headroom and three filter ranges.

2x2 auto-filter envelope follower. Funk and quack with internal trimmer setup.

Analog envelope filter with four controls: Sensitivity, Tone, Decay, and Q resonance. Works on guitar and bass.

Envelope filter with Stroke (sensitivity), Fwonk (bass), and Juice (peak height) controls.

Expanded envelope filter/wah/octave with three filter flavors, three octave voicings, and flexible routing.

Voltage-controlled low-pass envelope filter with sweep direction, resonance, and switchable range.

Legendary envelope filter with extensive parameters. Holy grail of envelope effects, now discontinued.

Lovetone Meatball clone. Dual-mode envelope follower and triggered filter with deep controls.

Fuzz into envelope filter with sidechain—Curt Bisquera's signature for funky quack and grit.

Optical envelope filter with HP/BP/LP modes, Q control, and touch-sensitive dynamics.

Funky, squawky envelope filter for wah-like quack.

Legendary downward-sweeping envelope filter from 1973 by Craig Anderton with voice-like synth response for funk and bass.

Dual-channel envelope filter/wah and octave for funk and soul with two filter modes and expression input.

Dual envelope filter with two independent filter sections. Stack up and down sweeps for complex bass funk.

Envelope filter that sweeps a resonant filter based on your pick attack. Auto-wah for funk rhythm and lead work.

Envelope filter with dynamic frequency response to playing dynamics.

Danish envelope filter considered the world's best auto-wah, Pino Palladino approved.

Hand-wired Snow White AutoWah. BJF envelope filter with lightning tracking, Finnish point-to-point build.

DIY PCB for building a Lovetone Meatball clone - the heavily tweaked Mu-Tron III envelope filter with blend and loop.

Compact envelope filter. The legendary Mu-Tron III character in smaller format.