The Warm Audio Mutation Phasor II is a Warm Audio phaser pedal, currently around $139.99. Close alternatives include the MXR Script Phase 90 (LED) and the Heavy Metal FX HMFX Phase Riot Factory Second. It pairs well with the Fender Deluxe Reverb and the 1959 Fender Tweed Deluxe.
Warm Audio Mutation Phasor II
Warm Audio · pedal
The Warm Audio Mutation Phasor II reproduces the Musitronics Mu-Tron Phasor II, a legendary 1970s phaser circuit prized by collectors and funk, psychedelic, and progressive rock players for a deeper, more envelope-responsive sweep than most conventional phasers offer. Mu-Tron's original units have become rare and expensive vintage collector pieces, making faithful clones like Warm Audio's an important way for modern players to access that specific, historically significant sweep character without hunting down and paying vintage prices for an aging original. Warm Audio built its reputation on accessible, accurate recreations of iconic vintage studio and effects hardware, and this phaser continues that mission within the modulation effects category specifically.
- phaser
- modulation
- funk
- psychedelic
- envelope
- distinctly different character
- desired tone
- vintage
Price updated Aug 26, 2026
Genres the Warm Audio Mutation Phasor II is commonly used in
- Progressive Rock
- Electronic
- Funk
Amps that pair well with the Warm Audio Mutation Phasor II
Pedals that stack with the Warm Audio Mutation Phasor II
Nobels ODR-1
Nobels
9% matchWhat Nobels ODR-1 brings here leans toward full — that's worth building a pairing around
Tech 21 SansAmp
Tech 21
9% matchTech 21 SansAmp leans toward analog warmth, and that's a real, usable character to pair with
Crazy Tube Circuits White Whale
Crazy Tube Circuits
7% matchRun Crazy Tube Circuits White Whale after Warm Audio Mutation Phasor II in the signal chain, clear of Warm Audio Mutation Phasor II's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Echoplex EP-3
Echoplex
7% matchEchoplex EP-3's analog warmth voice goes after Warm Audio Mutation Phasor II in the signal chain — it's not there to compete with Warm Audio Mutation Phasor II's own modulated character — goes in the amp's FX loop (or last, into a clean amp)
Cheaper alternatives
Tone City Summer Orange
Tone City
66% similarityShared character: phaser, modulation
Teisco Mini Analog Phaser
Teisco
62% similarityShared character: phaser, modulation
CNZ Audio SPH-20
Cnz Audio
95% similaritysimilar tone character
Valco Black Hole Vintage Phaser
Valco
94% similaritysimilar tone character
Behringer VP1 Vintage Phaser
Behringer
94% similaritysimilar tone character
Ibanez PH Mini Phaser Mini
Ibanez
93% similaritysimilar tone character
Boutique & premium upgrades
Walrus Audio Lillian Multi-Stage Analog Phaser
Walrus Audio
66% similarityShared character: phaser, stage, modulation
Citadel Planetary Phase
Citadel
65% similarityShared character: phaser, modulation
Carl Martin Two Faze
Carl Martin
94% similaritysimilar tone character
Alexander Pedals Luminous Phaseshifter
Alexander Pedals
94% similaritysimilar tone character
Death By Audio Moonbeam
Death By Audio
94% similaritysimilar tone character
EarthQuaker Devices Grand Orbiter
EarthQuaker Devices
94% similaritysimilar tone character
Similar charactersee all similar tone character →
MXR Script Phase 90 (LED)
MXR
70% similarityShared character: phaser, stage, modulation
Heavy Metal FX HMFX Phase Riot Factory Second
Heavy Metal Fx
69% similarityShared character: players, phaser, modulation
Alchemy Audio Phasor II
Alchemy Audio
69% similarityShared character: tone, phaser, original
Catalinbread Many Worlds
Catalinbread
69% similarityShared character: players, phaser, stage
T-Rex Sweeper 2
T Rex
67% similarityShared character: phaser, modulation, vintage_charm
AA Audio Rotary 3 toggle Phase, Vibe
Aa Audio
66% similarityShared character: players, phaser, modulation
See all alternatives to the Warm Audio Mutation Phasor II (cheaper + boutique) →
Questions people ask
What are good alternatives to the Warm Audio Mutation Phasor II?+
The closest matches in character are the MXR Script Phase 90 (LED), the Heavy Metal FX HMFX Phase Riot Factory Second, the Alchemy Audio Phasor II. Budget picks: Tone City Summer Orange, Teisco Mini Analog Phaser, CNZ Audio SPH-20. Boutique upgrades: Walrus Audio Lillian Multi-Stage Analog Phaser, Citadel Planetary Phase, Carl Martin Two Faze.
What pairs well with the Warm Audio Mutation Phasor II?+
Strong matches from rig and tone-complementarity evidence: Fender Deluxe Reverb, 1959 Fender Tweed Deluxe, Nobels ODR-1 — Fender Deluxe Reverb leans toward spring, and that's a real, usable character to pair with.
How much does the Warm Audio Mutation Phasor II cost?+
Around $139.99 (live listing price, updated Aug 26, 2026).