The Warm Audio Mutation Phasor II is a Warm Audio phaser pedal, currently around $139.99. Close alternatives include the Mooer Trelicopter and the Behringer BM-13 Phaser. It pairs well with the Mesa/Boogie JP-2C John Petrucci Signature 60/100-Watt and the Marshall Studio JCM900 SN20H.
Warm Audio Mutation Phasor II
Warm Audio · pedal
The Warm Audio Mutation Phasor II is a faithful clone of the Mu-Tron Phasor II from Warm Audio (Austin, Texas), capturing the vintage electro-optical phaser character of the original Mu-Tron Phasor II at the accessible $149 price point. Described as one of the cleanest, most subtle phasers available, it adds a tasteful phase modulation rather than the extreme jet-plane swoosh of many phasers, with interactive controls that reward nuanced adjustment.
What stands out
“most subtle phasers available”
— from the listing
“capturing the vintage electro-optical phaser character of the original mu-tron phasor ii at the accessible $149 price point”
— from the listing
“The Mutation Phasor II is praised as "a beautiful homage to the legendary Mu-Tron Phasor II" that impresses with unique modulation textures and remarkable high quality for its price”
— from the community notes
“Limitations: Subtle voicing is intentional but may feel underwhelming to players expecting strong, prominent phaser sweep”
— from the reviews
“Exceptional value for the voicing quality”
— from the reviews
- subtle
- modulation
- optical
- phaser
- enhances tone
- overdrive
- musical
- unique modulation textures
Price updated Oct 23, 2026
Amps that pair well with the Warm Audio Mutation Phasor II
Mesa/Boogie JP-2C John Petrucci Signature 60/100-Watt
Mesa Boogie
tonal matchComes later in the signal chain
Put Mesa/Boogie JP-2C John Petrucci Signature 60/100-Watt after Warm Audio Mutation Phasor II
Marshall Studio JCM900 SN20H
Marshall
tonal matchComes later in the signal chain
Put Marshall Studio JCM900 SN20H after Warm Audio Mutation Phasor II
Synergy SL2 Module
Synergy
tonal matchComes later in the signal chain
Synergy SL2 Module goes after Warm Audio Mutation Phasor II in the chain
Friedman BE-Mini Head
Friedman
tonal matchComes later in the signal chain
Friedman BE-Mini Head goes after Warm Audio Mutation Phasor II in the chain
Hughes & Kettner Warp 7
Hughes & Kettner
tonal matchComes later in the signal chain
Hughes & Kettner Warp 7 goes after Warm Audio Mutation Phasor II in the chain
Egnater Tourmaster Combo 4212
Egnater
tonal matchComes later in the signal chain
Put Egnater Tourmaster Combo 4212 after Warm Audio Mutation Phasor II
Hughes & Kettner Coreblade
Hughes & Kettner
tonal matchComes later in the signal chain
Put Hughes & Kettner Coreblade after Warm Audio Mutation Phasor II
Synergy Friedman DS Module
Synergy
tonal matchComes later in the signal chain
Synergy Friedman DS Module goes after Warm Audio Mutation Phasor II in the chain
Pedals that stack with the Warm Audio Mutation Phasor II
Fjord Fuzz Berserk
Fjord Fuzz
19% matchWhat Fjord Fuzz Berserk brings here leans toward aggressive — that's worth building a pairing around
Comes earlier in the signal chain
Wren and Cuff Box of War Small Foot Fuzz
Wren And Cuff
19% matchWren and Cuff Box of War Small Foot Fuzz's own fuzzy character is the real reason this is worth trying
Comes earlier in the signal chain
Boss DD-2 Digital Delay
Boss
6% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Run Boss DD-2 Digital Delay after Warm Audio Mutation Phasor II in the signal chain, where it won't crowd Warm Audio Mutation Phasor II — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Dunlop - MXR Carbon Copy Deluxe Analog Delay
Dunlop
6% matchRun Dunlop - MXR Carbon Copy Deluxe Analog Delay after Warm Audio Mutation Phasor II in the signal chain, where it won't crowd Warm Audio Mutation Phasor II — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Death By Audio Destruction
Death By Audio
tonal matchComes earlier in the signal chain
Put Death By Audio Destruction in front of Warm Audio Mutation Phasor II
Dr. Scientist Frazz Dazzler V2
Dr Scientist
tonal matchComes earlier in the signal chain
Dr. Scientist Frazz Dazzler V2 goes in front of Warm Audio Mutation Phasor II in the chain
Subdecay F-Bomb
Subdecay
tonal matchComes earlier in the signal chain
Put Subdecay F-Bomb in front of Warm Audio Mutation Phasor II
Warm Audio Jet Phaser
Warm Audio
tonal matchWarm Audio Jet Phaser goes after Warm Audio Mutation Phasor II — modulation reads clearest once the core tone is set
Cheaper alternatives
Valco Black Hole Vintage Phaser
Valco
54% similarityShared character: phaser, subtle
T-Rex Sweeper 2
T Rex
54% similarityShared character: phaser, modulation, subtle
Moen AM-TR Tremolo
Moen
51% similarityShared character: modulation, overdrive
Tone City Summer Orange
Tone City
50% similarityShared character: phaser, modulation
DigiTech XHP Hyper Phase
Digitech
50% similarityShared character: phaser, modulation, overdrive
Walrus Audio FS Phaser
Walrus Audio
89% similaritysimilar tone character
Boutique & premium upgrades
EarthQuaker Devices Grand Orbiter
EarthQuaker Devices
57% similarityShared character: phaser, subtle, overdrive
Dawner Prince Starla Tap Tempo Tremolo
Dawner Prince
55% similarityShared character: modulation, subtle
Citadel Planetary Phase
Citadel
54% similarityShared character: phaser, modulation
Death By Audio Moonbeam Stereo Multi-Stage Phaser
Death By Audio
51% similarityShared character: phaser, modulation, overdrive
EarthQuaker Devices Grand Orbiter Phase Machine V2
EarthQuaker Devices
90% similaritysimilar tone character
SolidGoldFX Aurras
Solidgoldfx
89% similaritysimilar tone character
Similar charactersee all similar tone character →
Mooer Trelicopter
Mooer
64% similarityShared character: modulation, subtle
Behringer BM-13 Phaser
Behringer
58% similarityShared character: phaser, modulation, subtle
Heavy Metal FX HMFX Phase Riot Factory Second
Heavy Metal Fx
56% similarityShared character: phaser, modulation
MXR Phase 100
MXR
55% similarityShared character: phaser, modulation, subtle
MXR Phase 95
MXR
55% similarityShared character: phaser, modulation, subtle
Wylde Audio WA90
Wylde Audio
52% similarityShared character: phaser, subtle, overdrive
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 Mooer Trelicopter, the Behringer BM-13 Phaser, the Heavy Metal FX HMFX Phase Riot Factory Second. Budget picks: Valco Black Hole Vintage Phaser, T-Rex Sweeper 2, Moen AM-TR Tremolo. Boutique upgrades: EarthQuaker Devices Grand Orbiter, Dawner Prince Starla Tap Tempo Tremolo, Citadel Planetary Phase.
What pairs well with the Warm Audio Mutation Phasor II?+
Strong matches from rig and tone-complementarity evidence: Mesa/Boogie JP-2C John Petrucci Signature 60/100-Watt, Marshall Studio JCM900 SN20H, Synergy SL2 Module — Put Mesa/Boogie JP-2C John Petrucci Signature 60/100-Watt after Warm Audio Mutation Phasor II.
How much does the Warm Audio Mutation Phasor II cost?+
Around $139.99 (live listing price, updated Oct 23, 2026).
Compare
- vs EarthQuaker Devices Grand Orbiter Phase Machine V2
- vs ThorpyFX Pulse Doppler
- vs Walrus Audio FS Phaser