“Yes, it’s another fuzz box, but it’s one that is particularly inspired”: Walrus Audio Silt Harmonic Fuzz review

Walrus Audio puts a tube in a fuzz box for all to see, plus a special Harmonic octave mode, and invites you to dig into the Silt

Walrus Audio Silt
(Image: © Future / Olly Curtis)

Guitar World Verdict

Yes, it’s another fuzz box, but it’s one that is particularly inspired – a great source for rich-sounding driven sounds with flexible EQ options, and the bonus of Harmonic mode that lets the sound really take off.


  • +

    Compact for a twin-footswitch pedal.

  • +

    Great range of fuzz and distortion sounds.

  • +

    Flexible EQ.

  • +

    Footswitchable Harmonic mode.


  • -

    Switching in Harmonic mode when the effect is engaged isn’t as seamless as we’d like.

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We’ve been seeing more fuzz boxes released than any other kind of pedal lately, several with a claim to having special characteristics. The latest from Walrus Audio is no exception, but its special characteristic is plain for all to see: a tube lit up in a front-panel window. 

The idea behind the pedal was to create a fuzz with the rich, harmonically complex texture that a real valve can provide, so Walrus Audio teamed up with valve expert Jim Hagerman to develop this design based around an ECC82/12AU7 preamp tube.

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Trevor Curwen

Trevor Curwen has played guitar for several decades – he's also mimed it on the UK's Top of the Pops. Much of his working life, though, has been spent behind the mixing desk, during which time he has built up a solid collection of the guitars, amps and pedals needed to cover just about any studio session. He writes pedal reviews for Guitarist and has contributed to Total Guitar, MusicRadar and Future Music among others.