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Warm Audio Warm Audio

Warm Audio Mutation Phasor II Effects Pedal Metal

Q&A SKU #M03393000001000
149.0 $149.00
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Electro-optical phase-shifting pedal that accurately recreates a funky, psychedelic phaser made famous in the 1970s.

The Warm Audio Mutation Phasor II effects pedal accurately recreates the deep phase-shifting psychedelic modulation of the original phaser made famous in studios during the 1970s. Add depth, wobble, swirl, or “instant funk” to guitar, keys, bass, or anything you can dream of.

For ultra-rich swirly phase-shifting, the “Depth” control allows you to vary the width of the sweep range—delivering deep modulation expected from a vintage all-analog pedal. Increasing the depth control adds width to the frequency range of the effect, impacting higher highs and lower lows. Easily change the speed (or rate) of the phase-shifting effect to create more or less “wobble” in your tone—from 1/10th sweeps per second (slowest) to 18 sweeps per second (fastest).

Increasing the “Feedback” control adds electric feedback to the “wet” phase-shifting signal. Increasing the feedback control creates a more intense phase sound with a particular emphasis on the sweeps—especially noticeable at slower rate settings.

A true-to-original recreation of the 70s circuit, the Mutation Phasor II is built with premium components, including classic RC4558P op-amps, vintage-style diodes, carbon resistors, and film caps—housed in an ultra-rough, vintage-vibe steel case.

Like all Warm Audio gear, the Mutation Phasor II is meticulously hand-tested and inspected by trained technicians in Austin, Texas. True to the original pedal, the Mutation Phasor II delivers all the rich depth and instant psychedelic tones, favored by innovative musicians and producers like Billy Corgan, Tom Bukovac, Robin Trower, and more.


  • Electro-optical phase-shifting pedal with feedback circuit
  • Premium components, including RC4558P op-amps, various vintage-style diodes, and hand-selected film capacitors and carbon resistors
  • Buffered bypass
  • 9-volt battery or external 9V regulated DC adapter (center-negative)

Get the funky sound of the 1970s. Order today.


Mutation Phasor II Effects Pedal Specifications:

  • Phasing Rate: .1Hz¬–18Hz
  • Controls: Rate, Depth and Feedback
  • Frequency Response: 20Hz–20KHz
  • Min Feedback: 4V RMS, 11.2V peak-to-peak
  • Max Feedback: 2V RMS, 5.6V peak-to-peak
  • Signal-to-noise ratio: 86 dB below 2V input
  • Current draw: 15 mA

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