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Neutrino Envelope Filter & Auto Wah Pedal

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Item: N13-4160

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Neutrino Envelope Filter & Auto Wah Pedal


The Keeley ‘Neutrino’ is an Optocoupler Based Envelop Filter & Auto Wah Pedal. This dynamic WAH sound is an effect based on players pick attack/strength. The harder the picking, the harder it “WAHs”!

The brand new Keeley Neutrino Envelope Filter and Auto-Wah! This funky, tripped-out circuit is something Keeley has wanted to do for over a decade and so far reviews have been stellar! Each Optocoupler is tuned to perfection; every Keeley Neutrino is like finding a magical vintage unit with that perfect tone!

The Keeley Neutrino gives players all the classic, funk, auto-wah sounds and that Jerry-In-A-Box sound. Keeley has used the classic Optocoupler design for a rich and warm depth to the effect. Envelope filter sound is an effect triggered by pick attack or strength. The harder players pick, the harder it “wahs”! Sounds bubble up from a deep rounded warmth to a shinning brilliance. Solo notes are individually expressive based on how hard users play. Create incredible vowel sounds! Chord-work “stabs” sound right out of the disco dictionary!!

The Neutrino Envelope Filter has a simple set of controls so players can explore a wealth of tones with ease.

There is a Gain control to set the input level to an appropriate strength so that players can trigger the effect with any type of pickups or instrument level. This control is critical. Users can pick an open string on the guitar and adjust this control until the wah sound rise and fall are heard. Set just right the Neutrino sounds like a wah pedal rocking back and forth as users play a note.

The peak control is how “sharp” or “warm” the effect is. Players can think of this a way to make wah sounds really mellow or really “quaky”!

The Filter Selector lets players choose between 3 types of filters to carve out different tones and timbers.

The Range Switch adjusts what frequencies are being stressed HI or LO!

A side-mounted Direction Switch allows players to control which direction the wah sound goes – Wah up, wah down!

The Neutrino Envelope Filter is designed to work with bass guitar and keyboards as well. Simply adjust the Gain to get it to trigger accordingly, then adjust the Peak control to set how much it “wahs”.

Use a Keeley Compressor after your Neutrino to create a wall of lushly filtered tones that really stand out. Then, even with the more delicate sounds of the BandPass or HighPass settings players will be able to improvise with stunning clarity. 


  • Optocoupler Based Envelop Filter & Auto Wah Pedal
  • Input Gain Control to accommodate a variety of different situations
  • Peak Control for how “Sharp” or “Warm” the effect is
  • Filter Selector for 3 different filter types
  • Range Switch for frequency emphasis (HI or LO)
  • Side Mounted Direction Switch to control the direction the WAH sound goes
  • Designed for use with Guitar, Bass Guitar, and Keyboards
  • Keeley Quality Engineering
  • Hand Built, Made in USA

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  • True Bypass
  • Width (Not Counting Jacks) – 2.35″
  • Height (Not Counting Jacks) – 4.41″
  • Standard 9V DC battery and 9V DC (center-negative) connection

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