Keeley Hydra Stereo Reverb & Tremolo review

A space-saving two-in-one pedal with top-drawer sounds

Keeley Hydra Stereo Reverb & Tremolo
(Image: © Future / Neil Godwin)

Guitar World Verdict

Not only a space-saving way to add both tremolo and reverb to your pedalboard, the Hydra also features quality sounds and has practical footswitching capabilities for handy onstage use.


  • +

    Tremolo and reverb in one box.

  • +

    Compact size.

  • +

    Extensive parameter set.

  • +

    Onboard presets.

  • +

    Tap tempo.

  • +

    Expression pedal functions.


  • -

    This one’s not for you if you don’t want tremolo and reverb next to each other in the signal chain.

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Maybe it was the idea of giving any amp the built-in ‘effects’ found in vintage Fender amps that spawned the first pedal to combine reverb and tremolo, but that type of stompbox has become a bit of staple represented by the likes of Strymon’s Flint, Fender’s TreVerb and Source Audio’s True Spring, to name just three. 

Now there’s a new one from Keeley. The brand is no stranger to this genre as it happens – we’ve already taken a look at its Verb-o-Trem series of pedals – but the Hydra brings something new to the table, condensing a host of features into a really pedalboard-friendly unit. 

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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.