Warm Audio ODD Box V1 and Mutation Phasor II review – near-faithful recreations that sound convincingly close to the real things

The Texan effects and audio specialist takes on the Fulltone OCD and the Mu-Tron Phasor II, and reinvents them for today's players. But do they hold up to the originals that inspired them?

Warm Audio Mutron Phaser and ODD
(Image: © Warm Audio)

Guitar World Verdict

At prices that are hard to beat, Warm Audio’s ODD and Mutation Phaser II are near-faithful recreations that sound convincingly close in tone to the real things.


  • +

    The tones are excellent, and hue close to the original.

  • +

    UK/US mode switch makes the ODD very versatile.

  • +

    Road-worthy build.

  • +

    Pedalboard-friendly and compact.

  • +

    Low noise.

  • +

    Low price!


  • -

    Mutation is not quite as wild as the original.

You can trust Guitar World Our expert reviewers spend hours testing and comparing guitar products so you can choose the best for you. Find out more about how we test.

If you’re like me, you did a double-take when you saw the images for the ODD and Mutation Phasor II. No, neither of them is the original stompbox that we’ve seen before (and probably own); rather, both are very faithful recreations of the originals from Warm Audio. 

Right now, Warm Audio is smoking hot with its “inspired by” pedals that accurately replicate the specs of tried-and-true originals that have attained legendary status. 

Thank you for reading 5 articles this month**

Join now for unlimited access

US pricing $3.99 per month or $39.00 per year

UK pricing £2.99 per month or £29.00 per year 

Europe pricing €3.49 per month or €34.00 per year

*Read 5 free articles per month without a subscription

Join now for unlimited access

Prices from £2.99/$3.99/€3.49

Paul Riario

Paul Riario has been the tech/gear editor and online video presence for Guitar World for over 25 years. Paul is one of the few gear editors who has actually played and owned nearly all the original gear that most guitarists wax poetically about, and has survived this long by knowing every useless musical tidbit of classic rock, new wave, hair metal, grunge, and alternative genres. When Paul is not riding his road bike at any given moment, he remains a working musician, playing in two bands called SuperTrans Am and Radio Nashville.