Pricing and availability

We compare 600+ stores and found this item at 10 stores. Prices updated .

Sweetwater
4.5 (11)
$149.00 $148.99 $0.01
Amazon
4.4 (14)
$148.99 New
$104.99 Used (Like New)
Reverb
5.0 (7)
$130.94 New
$70.00 Used
Musician's Friend
2.0 (1)
$149.00 $148.99 $0.01 · All time low
zZounds
4.5 (1)
$149.00
Thomann
4.6 (8)
$145.00 $144.00 $1.00 · All time low
Gear4Music
£125.00

Average Price: $137

Standard/Professional

$75

$201+

Price Tier

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High-end

Price History

Based on price data from 7 merchants for "Warm Audio Mutation Phasor II". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Introducing the Warm Audio Mutation Phasor II Phaser Pedal, a gear that makes you feel like you've stepped back to the 70s. This isn't just a phaser pedal, it's a homage to an era of musical experimentation, delivering swirling, psychedelic sounds. Its faithful reproduction of the original 70s circuit using high-quality components guarantees full sonority and accurate recreation of the classic phase-shifting modulation.

Whether you're after some depth, a bit of wobble, or instant funk, the Mutation Phasor II has got you covered. With controls for Rate, Depth, and Feedback, you can dial in the perfect amount of phase-shifting effect to suit your sound.

The Mutation Phasor II doesn't just sound good, it's built to last with an ultra-tough, vintage-vibe steel case. It's meticulously hand-tested and inspected by trained technicians in Austin, TX USA, ensuring you receive a pedal that's ready to rock right out of the box.

Key Features:

  • Electro-optical phase-shifting pedal
  • Faithful reproduction of the original 70s circuit
  • High-quality components for full sonority and psychedelic sounds
  • Controls: Rate, Depth, Feedback
  • 6.3 mm jack input and output
  • Power supply connection: Barrel connector 5.5 x 2.1 mm, centre negative
  • Power consumption: 150 mA
  • Powered by a 9 V battery or a 9 V DC mains adapter (not included)
  • Switchable true or buffered bypass
  • Meticulously hand-tested and inspected by trained technicians in Austin, TX USA

Product specs

Pedal Type Phaser
Analog/Digital Analog
Effects Optical Phaser
Inputs 1 x 1/4"
Outputs 1 x 1/4"
Bypass Switching Buffered Bypass
Power Source 9V DC power supply (sold separately)
Power Usage 150mA
Batteries 1 x 9V
Height 2"
Width 3.5"
Depth 6.5"
Weight 2 lbs.

FAQs

What kind of power supply does the Warm Audio Mutation Phasor II require?

The Warm Audio Mutation Phasor II requires a 9V DC power supply, which is sold separately. It can also be powered by a 9V battery.

Is the Warm Audio Mutation Phasor II suitable for use with instruments other than guitar?

Yes, the Warm Audio Mutation Phasor II can be used with a variety of instruments, including keyboards and bass, to add depth and swirling effects.

What type of bypass does the Warm Audio Mutation Phasor II feature?

The Warm Audio Mutation Phasor II features buffered bypass switching, which helps maintain signal integrity when the pedal is not in use.

How does the Warm Audio Mutation Phasor II differ from other phaser pedals?

The Warm Audio Mutation Phasor II is an analog pedal that replicates the vintage phaser sounds of the 1970s, offering a distinctive optical phaser effect with rich, swirling tones.

Can the Warm Audio Mutation Phasor II be used in a live performance setting?

Yes, the Warm Audio Mutation Phasor II is well-suited for live performances, providing consistent and reliable phasing effects with its durable build and buffered bypass.

TheSuperFunAwesomeHappyTimePedalShow

TheSuperFunAwesomeHappyTimePedalShow

Have you every heard anything lusher...?? Warm Audio Mutation Phasor II

Video thumbnail for Have you every heard anything lusher...?? Warm Audio Mutation Phasor II by TheSuperFunAwesomeHappyTimePedalShow

Have you every heard anything lusher...?? Warm Audio Mutation Phasor II

TheSuperFunAwesomeHappyTimePedalShow

TheSuperFunAwesomeHappyTimePedalShow

Video thumbnail for Warm Audio Mutation Phasor II & ODD Box by Reverb

Warm Audio Mutation Phasor II & ODD Box

Reverb

Reverb

Video thumbnail for The Star Phaser Of The 70s Is Back | Warm Audio Mutation Phasor II | Gear Corner by Kris Barocsi

The Star Phaser Of The 70s Is Back | Warm Audio Mutation Phasor II | Gear Corner

Kris Barocsi

Kris Barocsi

Video thumbnail for Warm Audio Mutation Phasor II Phaser Pedal Review by Travis Raab Guitar

Warm Audio Mutation Phasor II Phaser Pedal Review

Travis Raab Guitar

Travis Raab Guitar

Video thumbnail for Phaser Pedals Explained! NEW Warm Audio Mutation Phasor II on my Synths and Samplers! by The Midlife Synthesist

Phaser Pedals Explained! NEW Warm Audio Mutation Phasor II on my Synths and Samplers!

The Midlife Synthesist

The Midlife Synthesist

Video thumbnail for GET YOUR FUNK OUT: Warm Audio Mutation Phasor II Pedal Demo - Based off the Mu-Tron Phasor Pedal by Rhythm & Beard

GET YOUR FUNK OUT: Warm Audio Mutation Phasor II Pedal Demo - Based off the Mu-Tron Phasor Pedal

Rhythm & Beard

Rhythm & Beard

Video thumbnail for Mutation Phasor II Phaser Pedal by Warm Audio - Review & Demo! by Tom Butwin

Mutation Phasor II Phaser Pedal by Warm Audio - Review & Demo!

Tom Butwin

Tom Butwin

Video thumbnail for Warm Audio Mutation Phasor II Review by Gearspace Forum

Warm Audio Mutation Phasor II Review

Gearspace Forum

Gearspace Forum

Reviews

PROS

  • Quiet operation compared to similar models

  • Solid build quality and durability

  • Offers classic phaser effects with additional ring-mod, uni-vibe, and auto-wah flavors

  • Versatile across multiple instruments (guitar, bass, keys, synth, drums)

  • Affordable, offering good value for money

  • Aesthetically pleasing design

  • Rate control provides wide range from subtle to extreme effects

  • Encourages creative and funky play styles

  • High-quality recreation of classic pedals

CONS

  • Larger size may not fit well on smaller pedalboards

  • Rate control can be overly sensitive, requiring careful adjustment

  • Lacks easy battery access, complicating battery changes

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Warm Audio Mutation Phasor II.

Features and functionality

  • The Mutation Phasor II is optical, offering more complexity compared to other phasers, making it a versatile choice for varied phaser effects.

    Source
  • The preamp feature of Warm Audio pedals, including the Mutation Phasor II, is highlighted as an "always-on" feature due to its subtle enhancement of tone.

    Source

Comparisons

  • While both the Mutation Phasor II and Jet Phaser are large, the Jet Phaser is notably oversized, making the Mutation Phasor II more practical for pedalboard setups.

    Source
  • Users report noticeable volume loss with the Jet Phaser, while praising the Mutation Phasor II for its consistent output, making it a preferable choice for some.

    Source

User experience

  • An owner, after using the Mutation Phasor II, expressed satisfaction and plans to explore more phasers with envelope control, indicating the pedal's inspiring performance.

    Source

Use cases and applications

  • The Mutation Phasor II's optical design makes it suitable for users seeking a rich, dynamic phasing effect, without the need for additional fuzz.

    Source
  • The Mutation Phasor II can mimic harmonic tremolo with a "hint of watery goodness," appealing to those exploring textures beyond standard phaser effects.

    Source

Critic Reviews

Warm Audio Mutation Phasor II Review - Premier Guitar

premierguitar.com

Warm Audio's Mutation Phasor II is a stunning homage to vintage phasers, boasting impressive build quality and a rich, versatile sound palette. Its ergonomic controls allow for an expansive range of modulation tones, making it a delight for both guitarists and synth enthusiasts. However, the rate control could benefit from a gentler taper at lower speeds, which may limit some players' precision in achieving slower rates. Overall, this pedal offers a beautiful blend of aesthetic charm and functional depth, making it a worthy investment for those looking to enhance their sound without breaking the bank.

positive

Warm Audio Mutation Phasor ll review | MusicRadar

musicradar.com

The Warm Audio Mutation Phasor II delivers classic phaser sounds with vintage aesthetics at an affordable price. It excels in creating dynamic, aggressive effects, especially when paired with distortion pedals, making it perfect for genres that embrace bold tones. However, it lacks the versatility of the Mu-Tron Phasor III, which offers expanded chaining options. Overall, the Mutation Phasor II is a delightful addition for those seeking that retro vibe, though it may not suit every musical style.

positive

Warm Audio ODD Box V1 and Mutation Phasor II review | Guitar World

guitarworld.com

Warm Audio's Mutation Phasor II delivers impressive, near-authentic phasing tones reminiscent of vintage classics, all in a compact and road-ready design. While the pedal excels in low noise and versatility, it falls a bit short of the wildness found in its original counterpart. If you're seeking a reliable phaser that retains warmth and richness without the hissing issues of older models, this is a strong contender. However, those looking for extreme modulation might find the Mutation a touch too polite. A great value overall, but expect some trade-offs in character.

positive

Warm Audio Mutation Phasor II: A fantastic vintage effect for synths and studios

musictech.com

Warm Audio's Mutation Phasor II successfully channels the lush, vintage vibes of the legendary Mu-Tron Phasor II, delivering a highly flexible and studio-quality sound. With impressive headroom and a wide range of modulation rates, it excels in producing both subtle and intense phasing effects that cater to diverse musical styles. However, its somewhat bulky design may be a drawback for pedalboard space-conscious musicians. Overall, it strikes a balance between affordability and performance, making it a worthy addition for those looking to enhance their sonic palette.

positive

Warm Audio’s Mutation Phasor II – a faithful Mu-Tron clone

guitar.com

A stylish homage to the classic Mu-Tron Phasor II, Warm Audio's Mutation Phasor II offers a funk-infused twist on phasing effects. While it excels in delivering unique, rich tones and a versatile range of sound shaping, it may stray too far from conventional phaser expectations, potentially leading to unmusical results for some. Its solid construction and affordability make it a practical choice, but those seeking traditional phasing might find it lacking. Overall, it’s a captivating option for adventurous players willing to explore outside the box.

positive

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Artist usage

Add artist
See how Chris McQueen uses Warm Audio Mutation Phasor II

Chris McQueen

Guitarist

Snarky Puppy

...
Verified via YouTube

In this video recording of a post by Jamison Ross on the Snarky Puppy Instagram account we see the setup of different band members. First we see Chris McQueen 's pedalboard. The phaser by Warm Audio is visible in the lower right corner.

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

1 alternative for Warm Audio Mutation Phasor II, curated by the Equipboard community.

Mu-Tron Phasor II

$315.00

Vintage or Discontinued similar sound high-end alternative

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