Electro-Harmonix Pico Shimmer

The Electro-Harmonix Pico Shimmer is a compact digital shimmer reverb pedal released in 2026 at a list price of $149.00¹. It puts three variations on the shimmer theme into the Pico Series' smallest enclosure, described by Delicious Audio as "three very different shimmer reverbs in a box smaller than your phone"². Shimmer, in short, is reverb with pitch-shifted overtones layered into the tail, and the Pico Shimmer builds on the shimmer concepts of EHX's Oceans Reverb pedals¹.

The pedal combines reverb, modulation, delay and synthesis in one signal path, and each of its three Scenes uses a different signal chain, so the three modes are distinct effects rather than three flavors of one algorithm¹. A press-and-hold on the footswitch gives you infinite reverb on the fly, freezing the tail while you keep playing over it¹.

What it does: three shimmer scenes in a mini pedal

The Pico Shimmer is the latest entry in Electro-Harmonix's Pico Series, the brand's range of super-compact digital mini pedals that use DSP to fit some of EHX's most interesting designs into their smallest form factor⁵⁶. Premier Guitar calls it a pocket-sized pedal inspired by the popular Shimmer settings on the award-winning Canyon Delay and Oceans 11 Reverb⁷.

Each Scene is a complete effect with its own signal chain¹:

• Intergalactic: classic shimmer made up of polyphonic octaves, reverb, modulated delay and compression, with a string synthesis engine added¹
• Off-World: a smoother, mellower shimmer with enhanced delay modulation and vintage synthesizer textures¹
• Etherdust: a glitch shimmer where the delay time is randomized, creating stutters ranging from short granular sparkles to distinct glitch echoes¹

The Scene button cycles through the three modes, and the LED color indicates which one is active: green for Intergalactic, orange for Off-World and red for Etherdust, with the LED off in bypass mode¹⁸. Holding the Scene button engages Secondary Knob Functions, which Guitar Pedal X reports provide eight variable parameter controls in total¹⁸.

The three scenes in detail

Intergalactic is the classic shimmer of the three. MusicRadar describes it as built from "polyphonic octaves, reverb, modulated delay and compression" plus a string synthesis engine⁵. Within this Scene, the VOICE knob morphs the reverb character from a clean plate reverb at its minimum, through classic shimmer at noon, to ethereal strings at its maximum, which Guitar.com sums up as a way to "create cinematic atmospheres beyond time and space"¹⁴.

Off-World is the mellow option. EHX describes it as a smoother, mellower shimmer with enhanced delay modulation¹, and Gearnews found that with this algorithm the sound is more diffused and the delays more heavily modulated, with a retro feel⁹. MusicRadar's reviewer heard vintage synth textures in this Scene³.

Etherdust is the experimental one. The delay time is randomized, so the reverb tail stutters and breaks up; Gearnews describes the result as stutter effects and granular delay-like sounds⁹, while MusicRadar's product page calls it the "glitchy" option where a randomised delay time is applied to the reverb tails⁵.

The controls

The pedal keeps the Pico Series' small-panel format: four knobs, a Scene button and a footswitch¹³.

The Secondary Knob Functions are where the depth lives. Holding the Scene button remaps the four knobs, and MusicRadar reports that in this mode the controls adjust Reverb Mix, Delay, Depth and Rate⁵. Guitar Pedal X counts eight variable parameter controls across the pedal's normal and secondary modes⁸. MusicRadar's reviewer also highlights the Infinite Reverb as a powerful tool, "freezing your reverb and notes whilst you continue to play over it"³.

Power and connections

The Pico Shimmer is a mono pedal: one 1/4" TS input and one 1/4" TS output, with an input impedance of 2.2MΩ (max input +1.5dBu) and an output impedance of 680Ω (max output +2.1dBu)¹³. Guitar Pedal X notes it is a mono Pico pedal rather than stereo, aimed at mini boards, and that the writer wished it had been stereo overall⁸.

Power comes through a 9VDC power jack, with a current draw of 100mA at 9.0VDC, and a 9.6VDC-200mA power adapter is included in the box¹. Guitar.com reports the pedal ships with a standard EHX 9V power supply⁴.

Where it comes from: the Oceans Reverb and the Pico Series

The Pico Shimmer's algorithms descend from earlier EHX pedals. MusicRadar's review notes it pulls its algorithms and inspiration from the Oceans 11 Reverb, the Canyon delay and the pitch-shifting POG pedal families³, and Guitar Pedal X reports it combines algorithms from the Oceans, Canyon and POG pedals in its three modes⁸. EHX itself says it builds on shimmer concepts from the award-winning Oceans 11 Reverb pedals¹.

Within the Pico Series, the closest sibling is the Pico Oceans 3-Verb, a multi-function reverb that takes the Spring, Plate and Hall reverbs from the Oceans 11 and offers them in a smaller format¹⁰. It comes from the same NYC DSP series of mini digital pedals from EHX¹¹. The difference between the two is focus: the Oceans 3-Verb covers standard reverb types, while the Pico Shimmer is dedicated entirely to shimmer and its variations.

What reviewers said

MusicRadar's review rated the Pico Shimmer four stars out of five, finding that its three distinct scenes cover classic shimmer, synth pads and glitches with plenty of character and customization, though the reviewer noted it is sensitive and all too easy to overwhelm without careful study of the sounds³. The same review compared it with the Oceans 11, calling that pedal a key sibling inspiration and one to choose if control over a broader range of reverb settings matters more to you than shimmer specifically³.

Guitar Pedal X called it a noteworthy pedal with three variants of shimmer reverb and no fewer than eight variable parameter controls, cool for mono rigs and mini boards, while repeating the wish that it had been stereo⁸.

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