The Keeley Zoma is a stereo reverb and tremolo pedal from Keeley, built as what guitar.com's reviewer called "a stripped-down and no-nonsense take on Fender amp-style trem and reverb"1. It launched in October 2024 at $229, pairing a spring or plate reverb with a sine tremolo, harmonic tremolo or pitch vibrato in three preset combinations, and Robert Keeley himself called it "one of our crowning achievements"2.
Tremolo and reverb were the first sound effects built into amplifiers, and the Zoma brings that pairing into a modern stereo pedal3. Premier Guitar's reviewer put it to work in a recording session and took advantage of the stereo capabilities there4.
Three modes: spring, plate, harmonic tremolo and pitch vibrato
The Zoma's three-way mode toggle selects three fixed pairings of reverb and tremolo, chosen by Keeley from what Pedal of the Day called the most popular "Verbs and Trems"3. You select the tremolo and reverb modes together as a pair rather than independently7.
| Mode | Reverb | Tremolo / vibrato |
|---|---|---|
| SS | Spring Reverb | Sine Tremolo |
| PH | Plate Reverb | Harmonic Tremolo |
| PV | Plate Reverb | Pitch Vibrato |
What each pairing does, as Keeley describes it387:
- SS: Classic spring reverb paired with a sine wave tremolo for the timeless black-panel amp formula. The spring reverb simulates every detail of the classic vintage tube amp reverb sound, and the sine tremolo adjusts volume up and down with smooth sine wave modulation.
- PH: Smooth, bright plate reverb combined with swampy harmonic tremolo. The plate reverb recreates the lush tones of vibrating metal plates, and the harmonic tremolo replicates classic tube-amp harmonic tremolo, creating a phaser-like effect with phase-split filtering.
- PV: Plate reverb with pitch vibrato, which Keeley describes as a vocal-like vibrato with ethereal plate reverb. The pitch vibrato delivers pitch bending effects that let you control how far and how fast notes shift.
Premier Guitar's reviewer found the pairings musically distinct, noting that "the plate reverb leaves more space for the beautiful, liquid modulations from the harmonic tremolo and vibrato"4. The same reviewer compared the spring simulation directly against a Vibrolux and a Fender reverb tank and found the pings and clicks that follow transients particularly authentic4.
The controls and the alt functions
The control layout is shared with the I Get Around rotary simulator, in the same Beach Boys-inspired enclosure with RCA Bakelite style knobs and a crystal amp lens47. Two smaller knobs handle tremolo Depth and Rate, and the big reverb level control is sized so you can make adjustments with your toe49.
The alt functions are the Zoma's hidden second layer of controls. Hold the REVERB/ALT footswitch down while turning a knob and it adjusts a different parameter3:
| Knob | Normal function | Alt function (hold REVERB/ALT) |
|---|---|---|
| Rate | Tremolo rate | Reverb Tone |
| Depth | Tremolo depth | Tremolo Boost Volume |
| Level | Reverb level | Reverb Decay |
Premier Guitar's reviewer confirmed the same set: in alt mode you can change the reverb decay level, reverb tone, or the tremolo output level4.
The pedal has independent reverb and tremolo bypass footswitches, well spaced, with a blue Fender-style jewel lamp between them that blinks at the tremolo's rate4. That lamp is a direct nod to the Fender amp panel the pedal takes its cues from.
Can you put the tremolo before the reverb?
Yes, and this is one of the Zoma's most useful tricks. By default the tremolo sits after the reverb, in black-panel Fender style. Press and hold the reverb/alt switch and you can instead place the tremolo before the reverb, which Premier Guitar's reviewer described as giving a thicker, blurrier tone4. Players who want surf-style washes or a more washy, modulated reverb texture can flip the order without repatching anything.
Stereo connections and bypass
Top-mounted jacks offer both stereo ins and outs2, and the stereo field is a big part of the pedal's appeal: Pedal of the Day described "stereo, high-fidelity reverbs and luxurious tremolos" and a wonderfully warm, inviting sound with a gorgeous stereo field3.
The Zoma runs in either true bypass or silent buffered bypass, selectable, which gearnews.com noted allows for maximum flexibility in terms of signal chain placement5. If you run long cables or a large board, buffered bypass keeps your top end intact; if the Zoma sits next to other true bypass pedals, you can match it.
A streamlined successor to the Hydra
Guitar World described the Zoma as a spiritual successor to the Keeley Hydra stereo reverb and tremolo pedal2, and gearnews.com called it a continuing development of the Hydra5. Guitar Pedal X traced the lineage further back, calling it a follow-up to the limited edition California Girls, I Get Around, and the more recent Halo Core pedal7.
The trade-off against the Hydra is control. The Hydra offers a three-way switch selecting reverb type (Spring, Room, Plate) and tremolo type (Sine, Harmonic, Vibrato) with a Color knob, plus a remote switching input, where the Zoma fixes the pairings. Guitar Pedal X's reviewer summed up the choice: the Hydra remained his preferred format, with a greater feature set, more granularity and a significantly smaller footprint, while the Zoma is the streamlined take7. Guitar World likewise framed the Zoma as a reverb/tremolo two-in-one with a more streamlined control layout than the Strymon Flint, with less control and configuration10.
Guitar Pedal X also reported the Zoma as supposedly Keeley's most hi-fidelity pedal to date8.
The Zoma launched in a standard Silver edition and a more limited Custom Shop Sand colorway7. Guitar Pedal X later reported a Black edition as well8, so more than one finish may be available depending on the retailer and production run.
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Questions
How much does the Keeley Zoma cost?
The Zoma launched at $229 USD in October 2024, and guitar.com still listed it at $229 in August 2026. UK pricing was £289 and European pricing €359. It sits below the more feature-rich Keeley Hydra in the company's reverb and tremolo line.
Can you put the tremolo before the reverb on the Zoma?
Yes. By default the tremolo sits after the reverb, in black-panel Fender style. Press and hold the reverb/alt switch and you can flip the order, placing the tremolo before the reverb for a thicker, blurrier tone.
Is the Keeley Zoma true bypass?
It can be. The Zoma runs in either true bypass or silent buffered bypass, and the mode is selectable, so you can match it to the rest of your pedalboard and signal chain.
What power supply does the Keeley Zoma need?
The Zoma runs on a standard 9V DC jack, so a typical pedalboard power supply works. There is no battery option, so plan on a dedicated 9V supply.
What finishes does the Zoma come in?
It launched in a standard Silver edition and a more limited Custom Shop Sand colorway. Guitar Pedal X later reported a Black edition as well. The enclosure is the Beach Boys-inspired form factor used by the I Get Around rotary simulator, with RCA Bakelite style knobs.
Where is the Keeley Zoma made?
Like all Keeley pedals, the Zoma is designed and manufactured in the USA, according to Premier Guitar's launch coverage.
Sources (10)
- Source Audio Pathways review: “between the worlds of modernity and tradition”, guitar.com, 2026-08-05
- “Our most high fidelity pedal to date”: Keeley's new Zoma is a luxurious-sounding reverb/tremolo stompbox that serves as one of the brand's “crowning achievements”, Guitar World, 2024-10-28
- Keeley Electronics Zoma Stereo Reverb and Tremolo, Pedal of the Day, 2025-11-09
- Keeley Zoma Tremolo and Reverb Review, Premier Guitar, 2024-11-13
- Keeley Zoma combines Reverb and Tremolo in One Vibey Pedal, gearnews.com, 2024-10-25
- Experience High-Fidelity Reverb & Tremolo with Keeley ZOMA, Premier Guitar, 2024-10-24
- Guitar Pedal X, Guitar Pedal X, 2024-10-25
- Guitar Pedal X, Guitar Pedal X, 2024-12-20
- Keeley Zoma Stereo Spring Reverb + Tremolo, Delicious Audio, 2025-02-25
- Strymon Flint Tremolo & Reverb V2 review, Guitar World, 2026-09-16
