Pricing and availability
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Price
Average Price: $235
Standard/Professional
$150
$601+
Price Tier
Budget
Standard
High-end
Price History
Based on price data from 5 merchants for "Keeley Hydra Stereo Reverb & Tremolo". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Unleash the power of the ocean with the Keeley Hydra, a high-fidelity Reverb and Tremolo effects pedal designed to add expansive depth to your musical performance. This feature-rich pedal brings the perfect blend of space and dimension to your guitar, bass, or keyboard signal.
Submerge your sound in Spring, Plate, or Room Reverb, and then ride the waves with tap tempo-enabled Harmonic, Vibrato, or Sine Wave Tremolo at the press of a button. The Hydra's smart Alt Controls allow for easy changes to the order of effects and the character of the Tremolo or Reverb. With the ability to create an Infinite Hold Reverb Trail, this pedal is more than just an effects unit, it's a musical instrument in its own right.
Save up to three presets with the intuitive save feature, and engage Reverb Trails on the fly. The Hydra is compatible with pro remote switching systems and offers both TRS Expression Pedal and External Tap-Tempo inputs. This pedal is a complete end-of-pedalboard solution that fits perfectly in any musician’s rig, regardless of genre. Experience the next-level processing power of the Hydra in a pedalboard-friendly enclosure.
Key Features:
- True Stereo high-fidelity Reverb and Tremolo effects
- 3 selectable studio-quality reverb modes: Spring, Plate, Room
- 3 selectable tremolo modes with vintage voicing: harmonic, vibrato, sine wave
- Onboard and remote tap tempo
- 3 footswitchable presets
- Intuitive Alt control options for additional effect parameters
- Infinite Hold Reverb Trails via footswitch
- Expression pedal control assignable to each controller
- Effects order can be changed as desired
- True bypass or buffered trails (switchable)
- TRS Expression Pedal and External Tap-Tempo inputs
- Compatible with pro remote switching systems
- Pedalboard-friendly enclosure
- Built-in USA
Product specs
| Pedal Type | Stereo Reverb, Tremolo |
| Analog/Digital | Digital |
| Presets | 3 x User |
| Effects | 3 x Reverbs: Spring, Plate, Room ; 3 x Tremolo: Vibrato, Sine Tremolo, Vintage Harmonic |
| Inputs | 2 x 1/4" (L/mono,R) |
| Outputs | 2 x 1/4" (L/mono,R) |
| Other I/O | 1 x 1/4" TRS (expression), 1 x 1/4" TRS (tap tempo) |
| True Bypass | Yes, Switchable to Trails Mode |
| Bypass Switching | Buffered/True (switchable) |
| Power Source | 9V DC power supply required (sold separately) |
| Power Usage | 115mA |
| Height | 2.2" |
| Width | 2.5" |
| Depth | 4.7" |
| Weight | 0.77 lbs. |
FAQs
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What types of reverb does the Keeley Hydra offer?
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The Keeley Hydra Stereo Reverb & Tremolo provides three types of reverb: Spring, Plate, and Room, allowing for a wide range of ambient textures suitable for various musical styles.
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Can the Keeley Hydra be used in stereo setups?
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Yes, the Keeley Hydra is designed for stereo use, featuring two 1/4" inputs and two 1/4" outputs for true stereo operation, making it ideal for expansive soundscapes.
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Does the Keeley Hydra support expression pedal control?
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The Keeley Hydra includes a 1/4" TRS input for an expression pedal, allowing you to control various parameters in real-time for dynamic performance adjustments.
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Is it possible to save presets on the Keeley Hydra?
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Yes, the Keeley Hydra allows you to save up to three user presets, enabling quick recall of your favorite settings during performances or recording sessions.
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What power requirements does the Keeley Hydra have?
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The Keeley Hydra requires a 9V DC power supply with a power usage of 115mA, which is sold separately, to ensure optimal performance.
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How can I perform a factory reset on the Keeley Hydra?
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To reset the Keeley Hydra, hold down the COLOR knob and both the TREMOLO and REVERB footswitches while powering the unit. All LEDs will flash, indicating the reset is complete.
Videos
The Pedal Zone
Keeley Electronics Hydra Stereo Reverb & Tremolo Demo (In Stereo - Please Use Headphones)
Keeley Electronics Hydra Stereo Reverb & Tremolo Demo (In Stereo - Please Use Headphones)
The Pedal Zone
Keeley Hydra | Get Lost In The Stereo Tones
Rabea Massaad
Keeley Electronics HYDRA Stereo Reverb and Tremolo - Technical Demo
Keeley Electronics
Keeley Hydra Tremolo Reverb
Mike Hermans
From The Surf To The Clouds | Keeley Hydra Reverb & Tremolo
JayLeonardJ
3 TYPES OF TREMOLO AND REVERB, ONE PEDAL - KEELEY HYDRA
Pete Thorn
Keeley: HYDRA Stereo Reverb & Tremolo
Brett Kingman
Robert Keeley talks about the Keeley Electronics HYDRA Stereo Reverb and Tremolo
Keeley Electronics
Keeley Hydra Stereo Reverb & Tremolo Pedal Demo
Guitarist
THE BEST REVERB AND TREMOLO PEDAL EVER?! Hydra - Keeley Electronics Demo
HarryAndAGuitar
Keeley Electronics Hydra - Beautiful Stereo Reverbs & Tremolos!
PMTVUK
Reviews
PROS
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Compact size, fits well on pedalboards
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Versatile with stereo inputs and outputs
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Offers three reverb and three tremolo types
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Reverb modulation including shimmer and spring age
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True bypass or buffered bypass selectable
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Expression pedal for parameter control
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Infinite reverb hold function
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High-quality, studio-ready sound
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Good tremolo panning effect in stereo
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Three customizable preset banks
CONS
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Occasional issues with knobs or switches falling off
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Some reports of popping sound when engaged
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Preset switching can be cumbersome
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Reverb quality may not meet all expectations
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Complexity may overwhelm some users
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Keeley Hydra Stereo Reverb & Tremolo.
User experience
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Some users notice a tonal change with tremolo engaged, described as "darkening" the sound, prompting checks for potential defects.
Source -
The Hydra is noted for having a fourth, unofficial preset by switching back to where the current settings are, enhancing versatility.
Source -
Some users find the controls initially challenging but recommend setting up presets to simplify usage and improve experience.
Source
Use cases and applications
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The pedal's spring reverb can create a "drippy" authentic sound suitable for surf styles, adding to its versatility beyond ambient genres.
Source -
The Hydra's plate reverb is particularly praised for acoustic guitar, offering a studio-worthy sound that can be adjusted for brightness or darkness.
Source -
The pedal caters well to rock/funk styles, contrary to its ambient-oriented demos, with room reverb settings noted for handling overdrive/distortion effectively.
Source -
The pedal excels in pedalboard efficiency by combining reverb and tremolo, reducing the need for separate pedals.
Source
Features and functionality
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The Hydra offers footswitch features like tap tempo and reverb hold, with expression pedal compatibility and external tap options for diverse stereo configurations.
Source -
The "color" knob enhances reverb quality, allowing users to fine-tune from good to great sounding reverbs, particularly noted for its impact on spring and plate reverbs.
Source -
The Hydra's depth knob has a secondary function, acting as a trem level that can boost up to +6db, addressing perceived volume loss during tremolo use.
Source -
The Hydra serves as both an auto-panner and harmonic tremolo, providing Leslie-like vibes and excellent stereo functionality.
Source -
Users appreciate the ability to reorder tremolo and reverb on the fly and switch between mono/stereo/wet dry seamlessly.
Source
Comparisons
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Compared to the MXR M159, the Hydra offers stereo tremolo with added reverb functionality, being a versatile replacement for stereo tremolos with broken reverb capabilities.
Source -
Owners shifting from Source Audio Vertigo highlight Hydra's unique features like harmonic tremolo and flexible stereo/mono switching.
Source -
The Hydra's spring reverb is highly regarded, with some users preferring it over the Topanga for its versatility, although they acknowledge Topanga's unique tone.
Source
Other
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Some units have minor cosmetic imperfections, such as off-center graphics, which some users find negligible.
Source
Setup and maintenance
Critic Reviews
4.0 out of 5
Based on 1 Review and 3 Ratings
350
Kinda broken
TL;DR
Pros: • 3 banks • Reverb modulation control (spring age, etc.) • Tap tempo • Infinite Hold • Cool tremolo • Small and lightweight
Cons: • Occasionally turning into "All Wet" mode (broken) • Loud pop when turning effect on (broken) • Low quality reverb sound • Complex • Switching presets takes time (too much tapping!)
I ordered hydra couple weeks ago. After first few hours of playing the tremolo depth knob fell off. Sometimes when I plugged Hydra to the power it switched to all wet mode, which was annoying and without a manual hard to revert. I think my Hydra was broken, whenever I turned it on there was a pop in my amp, which makes this effect unplayable. The reverb seems small and cheap when compared to other reverb effects, like Strymon BlueSky - maybe it isn't, but that's how it felt.
Great features are: 3 banks, reverb modulation control (spring age, shimmer amount, etc.), tap tempo, infinite hold, tremolo. However switching between presets takes time and it's hard to do during song - you must perform multiple taps. Also Hydra is small and lightweight, which makes it perfect to fit any board.
For the price of 300$ I would expect Hydra to work properly and much better reverb quality.
28603
Keeley will usually fix your pedal no matter how long ago you bought it. I had a similar thing with mine at one point but it's cause one of the switches got held down while power was off and put it into latching mode. It is a little picky with power supplies though.
Artist usage
Add artist
Andy Timmons stopped by Sweetwater Sound HQ with his full pedalboard
According to an article by Goodwood Audio in which his 2021 pedalboard build is detailed, Ariel Posen uses the Keeley Hydra Stereo Reverb & Tremolo.
In a user-uploaded photo, Ayla Tesler-Mabe is seen with the Keeley Hydra guitar pedal, highlighting her use of this effect in her setup.
Under the description of this Instagram video, Miller mentioned that she is playing her Equitz Ashford through the Keeley Hydra pedal.
In a video by Living Room GD, Eirik Stordrange is shown using the Keeley Electronics Hydra, highlighting its stereo reverb and tremolo features.
In this Instagram post, a Keeley Hydra is seen in the top left position of Corey Congilio's pedalboard.
In a video on Ally McErlaine's YouTube channel, titled "Ally McErlaine plays The Gold Hour by Red Sky July," the Keeley Hydra Stereo Reverb & Tremolo pedal is both seen and mentioned as part of the equipment used.
Album Usage
The Keeley Hydra Stereo Reverb & Tremolo has been featured on the following albums:
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use Keeley Hydra Stereo Reverb & Tremolo, it is most commonly used with the following gear.
Community setups
Show yours
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