Mutation Phasor II
Warm Audio Discontinued

Mutation Phasor II

Analog electro-optical phaser pedal with a feedback control, recreating a 1970s phase-shifting circuit. Aimed at guitarists, bassists and keyboard players who want vintage swirl, wobble and resonant phasing.

  • 100% analog electro-optical phaser
  • Feedback circuit for more resonant phasing
  • Recreation of a 1970s phaser circuit
  • RC4558P op-amps, carbon resistors, film caps
  • Vintage-style diodes in the signal path
  • Steel enclosure
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Description

The Mutation Phasor II is a 100% analog phaser pedal that recreates a well-known 1970s electro-optical phase-shifting circuit. It is intended for adding depth, wobble and swirl to guitar, bass, keys or other sources, and a feedback circuit lets the player push the phase sweeps into more resonant, underwater-sounding territory.

The circuit is built to the original spec with RC4558P op-amps, vintage-style diodes, carbon resistors and film capacitors. It is housed in a steel enclosure. Depth and speed settings shape the modulation, while the feedback control emphasises the sweeps.

The pedal is positioned alongside the maker's Warm Bender fuzz as a suggested pairing. A manual and product registration are available from the maker.

Video

Specifications

Brand
Warm Audio
Model
Mutation Phasor II
Category
Effects and pedals

Audio

Type
Electro-optical phase shifter
Signal path
100% analog
Feedback circuit
Yes
Intended sources
Guitar, bass, keys

Circuit

Op-amps
RC4558P
Diodes
Vintage-style
Resistors
Carbon
Capacitors
Film

Physical

Enclosure
Steel case
Style
Vintage-vibe

Software

Documentation
Downloadable manual
Registration
Online product registration

Data: warmaudio.com; photos: Warm Audio product page · updated 2026-10-11 · Found a mistake? Write to us