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Analog Fox Envelope Filter main image

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Analog Fox Envelope Filter

Analog Fox Envelope Filter

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Page last updated Feb 12, 2026

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Description

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Our Envelope Filter is based on DOD 440, which became famous after Johny Greenwood from Radiohead used it in their live shows.

The circuit uses Vtl5c4/2 optical chip that triggers the high-pass filter the more you hit the strings.

The controls are “Level” (duration of the effect) and “Range” (sensitivity). Note that if you set “Range” too high, the signal overdrives the optical chip and produces a distortion effect.

We modified the circuit by increasing input and output capacitors' values, so the effect has more low end than the original.

We also added a resistor that limits the output of the unit so it does not boost the signal too much.

Videos

intheblues

Analog Fox Envelope Filter Pedal (Auto Wah / Funky!)

Video thumbnail for Analog Fox Envelope Filter Pedal (Auto Wah / Funky!) by intheblues

Analog Fox Envelope Filter Pedal (Auto Wah / Funky!)

intheblues

Video thumbnail for Analog Fox Envelope Filter Guitar Effect Demo by drowninginguitars

Analog Fox Envelope Filter Guitar Effect Demo

drowninginguitars

drowninginguitars

Video thumbnail for Analog Fox Envelope Filter by Analog Fox

Analog Fox Envelope Filter

Analog Fox

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Added to Equipboard on 02-24-2021 by

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