Electro-Harmonix Cntl Knob review

A pedalboard-friendly alternative to an expression pedal

Electro-Harmonix Cntl Knob
(Image: © Future / Phil Barker)

Guitar World Verdict

An inexpensive, clever utility stompbox that will expand your pedalboard possibilities while saving space.


  • +

    Very cheap.

  • +

    Very compact.

  • +

    Very effective.


  • -

    Nothing, unless you need the treadle.

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.

We’ve probably all got one or more pedals that have an input for expression pedal control… and we’ve probably all got one or more reasons why we don’t always use them. 

Maybe we don’t own an expression pedal or we think it’s too much of a faff to set up. Or maybe it’s simply that an expression pedal (or indeed multiple expression pedals) can take up valuable real estate on our pedalboards

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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.