Neutrino V2 Envelope Filter


Keeley’s Funky, Tripped-Out Neutrino Envelope Filter and Auto Wah!

This dynamic wah sound is based on your pick attack or strength. The harder you pick, the harder it “wahs”!

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Keeley’s New Neutrino V2 Envelope Filter!

The Keeley Neutrino V2 is an amazingly toneful and compact form of the classic opto-coupler envelope filter.  The Neutrino takes your guitar playing and creates an automatic wah sound based on your pick attack!  Envelope filters or auto-wahs as they are often called, sound and react best when they are opto-coupler based.  The opto-couplers used in the Neutrino are particularly smooth, giving you an amazing vowel-like tone.  The Keeley Neutrino gives you 3 filter ranges, 2 directions,  2 ranges for the frequency center and a Peak control.  Keeley has engineered a power supply voltage-doubler so you maintain the highest headroom for your tone.   An incredibly tough build means it will last for many decades to come.  Whether you’re in a jam band or playing funk, the Keeley Neutrino V2 delivers incredible vocal-like tone.

  • Envelope Filter and Auto-Wah for guitar, bass and keyboard
  • Peak Control: Sets how much “quack” there is, or how smooth you roll
  • Filter Selector: lets you choose between 3 types of filters: High,  Low, and Band Pass.
  • Range Switch: HI or LO.
  • Direction Switch: Up or Down
  • True-Bypass, 9 VDC, 25 mA, 100% analog and made in the USA.


Shows how sexy the Neutrino V2 is next side to the ECCOS.

Keeley’s new Neutrino V2 has side mounted output volume and is still 100% analog and opto-coupler based!


Additional information

New or B Stock

New, B Stock


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