The Electro-Harmonix Pico Shimmer Cosmic Reverb is a compact digital shimmer reverb pedal, released in 2026 as the latest entry in Electro-Harmonix's Pico series of mini pedals1. It combines reverb, modulation, delay and synthesis in one pocket-sized box, and Electro-Harmonix describes it as ranging "from classic shimmer to mellow synth pads to sparkling glitch"2.
The pedal builds on the Shimmer concepts from EHX's Oceans Reverb pedals, and pulls its algorithms and inspiration from earlier EHX designs including the Oceans 11 Reverb, the Canyon delay and the pitch-shifting POG pedal family21. It carries a US street price of $149.003.
The controls
Four knobs and a Scene button handle everything on the surface. According to the maker, TIME controls decay time from short to infinite, and TONE adjusts the overall brightness of the effect2. Blend sets the wet/dry mix, and the Voice knob morphs the reverb character4.
| Control | Primary function | Source |
|---|---|---|
| Blend | Overall wet/dry mix | 4 |
| Time | Reverb decay time, up to infinite | 2 |
| Tone | Brightness of the effect | 2 |
| Voice | Morphs the reverb character | 4 |
| Scene button | Cycles through the three Scenes | 5 |
There is a second layer. Press and hold the Scene button and the same four knobs take on secondary roles: MusicRadar reports that in this mode "the aforementioned controls now adjust Reverb Mix, Delay, Depth and Rate"5. Guitar Pedal X counts this as eight variable parameter controls in total across the two layers, accessed through what it calls the cyan Alternative Settings6.
The three Scenes: Intergalactic, Off-World and Etherdust
The Scene button at the top of the pedal cycles through three modes, each a different take on shimmer5. Each combines a different blend of reverb, delay and modulation, plus octaves and a string synth element4.
| Scene | Character | Source |
|---|---|---|
| Intergalactic | Classic shimmer: polyphonic octaves, reverb, modulated delay and compression with a string synthesis engine; morphs between plate reverb, classic shimmer and ethereal strings | 23 |
| Off-World | Smoother, mellower shimmer with enhanced delay modulation and vintage synthesizer textures | 23 |
| Etherdust | Glitch shimmer with randomized delay time, creating stutters from short granular sparkles to distinct glitch echoes | 3 |
Gearnews describes the Intergalactic algorithm as "classic polyphonic octave-shifted reverb tails, mixed with a touch of modulated delay and a special 'string engine'"7. MusicRadar calls Ether Dust the wildcard setting, with a randomised delay time that creates "everything from crazy stutters to sparkly, elongated glitchy noise"1.
Guitar Pedal X color-codes the three: green for classic Intergalactic, orange for mellow Off-World, and red for glitchy Etherdust6.
Infinite reverb and the footswitch
The single footswitch does double duty. A tap engages the pedal, and press-and-hold puts it into Infinite Reverb Mode, sustaining the reverb indefinitely while you hold5. Premier Guitar describes it as "instant infinite reverb on the fly"3, and Delicious Audio calls it "a footswitch that gives you infinite reverb on a press-and-hold"8.
The TIME knob also reaches infinite decay at its maximum setting, so endless tails are available without the hold function2. This mirrors the approach on the related Pico Oceans 3-Verb, where EHX says infinite reverb can be achieved either by maxing out the TIME control in Plate or Hall mode or by pressing and holding the footswitch9.
Where its algorithms come from
Electro-Harmonix says the Pico Shimmer builds on Shimmer concepts from its award-winning Oceans Reverb pedals2. MusicRadar traces the lineage further: "EHX's superlative Oceans Reverb plants the seed, and the three variations on the Shimmer theme descend from this"5. Guitar Pedal X reports that the pedal combines algorithms from the Oceans, Canyon and POG pedals across its three modes6.
Guitar.com notes the pedal is specifically inspired by the Shimmer settings on the Canyon Delay and Oceans 11 Reverb4. MusicRadar points players who want deeper control over their reverb settings toward the full-size Oceans 11, calling it "a key sibling inspiration for the Pico Shimmer, which borrows some of its Shimmer Reverb algorithms"1.
What reviewers said
MusicRadar's review was positive on the whole, calling the pedal "a surprisingly advanced and feature packed entry for the budget conscious musician" and saying it "packs a powerful glittery punch into a tiny pedal, defying convention"1.
Guitar Pedal X took a more mixed view. On the plus side, it called the pedal noteworthy, with three variants of shimmer reverb and no fewer than eight variable parameter controls. On the minus side, the writer wished it were stereo, noting it is "a mono Pico pedal rather than stereo, aimed at mini boards"6.
The Pico Shimmer is mono only, with a single TS input and output21. Players running stereo rigs will need to look elsewhere, and the 100mA current draw at 9.0VDC2 rules out battery power.
Videos
EHX
Buddy Pumba
Questions
Does the EHX Pico Shimmer have infinite reverb?
Yes. Pressing and holding the footswitch puts the pedal into Infinite Reverb Mode, which sustains the reverb for as long as you hold. The TIME knob also reaches infinite decay at its maximum setting, so you can get endless tails either way.
Is the Pico Shimmer stereo?
No. It is a mono pedal with a single 1/4 inch TS input and a single 1/4 inch TS output. Guitar Pedal X notes it is aimed at mini boards and mono rigs rather than stereo setups, and wishes it came in a stereo format.
What bypass modes does the Pico Shimmer have?
Three selectable buffered bypass modes: Digital Bypass, Analog Bypass, and Hybrid Bypass. You can choose which one suits your signal chain, which is unusual flexibility for a pedal this small.
How much current does the Pico Shimmer draw?
Electro-Harmonix lists the current draw as 100mA at 9.0VDC. MusicRadar's review lists it as 9.6V DC at 200mA with a power adapter included, so the two sources disagree on the exact figure. Either way, plan for a proper power supply rather than a battery.
How does Infinite Reverb work on the Pico Shimmer?
Press and hold the footswitch and the pedal enters Infinite Reverb Mode, freezing the reverb tail while you keep holding. Premier Guitar describes it as instant infinite reverb on the fly, useful for swells and ambient pads under your playing.
What are the hidden alternative settings on the Pico Shimmer?
Press and hold the Scene button to access a set of alternative settings, shown in cyan, that reassign the four knobs. In this mode Blend, Time, Voice and Tone adjust Reverb Mix, Delay, Depth and Rate instead, giving eight variable parameter controls in total.
Sources (9)
- Electro-Harmonix Pico Shimmer Cosmic Reverb review, MusicRadar, 2026-10-19
- Pico Shimmer, Electro-Harmonix
- Electro-Harmonix Introduces The Pico Shimmer Cosmic Reverb, Premier Guitar, 2026-06-09
- “Otherwordly reverbs in a compact package”: Meet the Electro-Harmonix Pico Shimmer Cosmic Reverb, Guitar.com, 2026-06-10
- EHX's Pico Shimmer is a “Cosmic Reverb” for spaced-out tones, MusicRadar, 2026-06-10
- Guitar Pedal X, Guitar Pedal X, 2026-06-11
- EHX Pico Shimmer: A Mini 3-in-1 Ambient Reverb Machine, gearnews.com, 2026-06-10
- New Pedal: Electro-Harmonix Pico Shimmer Cosmic Reverb, Delicious Audio, 2026-06-10
- Pico Oceans 3-Verb, Electro-Harmonix (ehx.com)
