Electro-Harmonix has released the Pico Shimmer Cosmic Reverb, a sub-compact ambient reverb that's available now for $149. It takes the shimmer settings EHX already built into the Canyon Delay and the Oceans 11 Reverb and gives them their own dedicated box, with three scenes — INTERGALACTIC, OFF-WORLD, and ETHERDUST — that go well past plain octave-up shimmer.
I want to be useful here rather than just retype the spec sheet, because most of the people reading this run a Helix, an HX Stomp, or a Quad Cortex — and a fair chunk of what this pedal does is already sitting unused in those units. So I'll cover what the pedal actually is, then walk through which of these sounds you can build on your modeler tonight for free, and which one is the reason you might still want the $149 box on the board.
What the Pico Shimmer Actually Does
It's a Pico — sub-compact, top-mounted jacks, runs on a standard EHX 9V supply (included). Four knobs and a scene button is the whole interface:
- Blend — wet/dry mix
- Tone — overall brightness of the wet signal
- Time — reverb decay, and it stretches to infinite reverb at the maximum
- Voice — morphs the character of the reverb within whichever scene you're in
- Scene button — selects between the three scenes; hold it to access secondary functions (reverb mix, delay time, and modulation depth/rate)
- Footswitch — press and hold for an instant infinite-reverb freeze
The three scenes are where it earns the "cosmic" name:
- Intergalactic — the maximalist one. Polyphonic octaves, reverb, modulated delay, and compression, plus a string-synth engine. The Voice knob morphs you from a plate, through classic shimmer, into a pad of ethereal synth strings.
- Off-World — a smoother, mellower shimmer with heavier delay modulation and vintage-synth-flavored textures. This is the "pad under the verse" sound.
- Etherdust — the weird one. The delay time is randomized, so the shimmer breaks up into anything from short granular sparkles to distinct glitchy echoes.
That's a genuinely thoughtful spread — three different use cases for shimmer, not three flavors of the same thing. Now let's talk about what that means if you're already running a modeler.
Two of These Three Scenes Are Free on a Helix or HX Stomp
Shimmer is not a mysterious effect. At its core it's a reverb with a pitch shifter (usually +12, sometimes +12 and +19 together) fed into the regeneration or running alongside it. Every modeler worth owning can build that, and several have a shimmer reverb already modeled.
The classic shimmer (Off-World territory). On Helix and HX Stomp, the fastest path is the Glitz reverb — it's the built-in shimmer model, with octave and shimmer-level controls right in the block. Dial the shimmer back a touch, roll some high end off, and you're in Off-World's smoother, mellower lane. If you want more control over the octave content, the better-sounding route is a parallel path: split the signal, run a clean reverb (Searchlights or Ganymede) on one leg, and put a Poly Pitch block set to +12 before the reverb on the other leg so only the octave-up signal washes out. That parallel approach keeps your dry note clear while the shimmer blooms underneath — the same reason I argue for parallel reverb routing on almost every ambient patch. The modulated-delay layer EHX bakes into the scene? Add a modulated delay block in front, or just lean on the movement-on-the-tail trick and let a modulated reverb do that work.
The glitch shimmer (Etherdust territory). Randomized, stuttering, granular repeats are exactly what a Glitch/Glitz delay or a heavily modulated ping-pong with low feedback and a short, wandering time will give you. It won't be a one-knob morph the way the Pico does it, but the sound is reachable. Park it on a snapshot and forget it.
So if your reason for wanting this pedal is "I need shimmer for builds," and you already own a Helix or Stomp — you have it. Build the patch, save it to a snapshot, done. This is the same logic behind the whole worship Helix preset walkthrough: the unit already does more than most players ever turn on.
The One Scene That's Hard to Fake — and the Case for the $149
Here's where I stop being dismissive. Intergalactic's string-synth engine is the part your modeler does not do well. Polyphonic octaves plus a dedicated synth-string voice, morphing on one knob, is a specific sound — that "the guitar became a pad of strings" moment during a bridge or an instrumental swell. You can approximate it with a synth block stacked under reverb, but it's fiddly, it eats DSP, and it never quite lands the way a purpose-built engine does. If that pad is a sound you reach for every week, the Pico does it cleanly in one box.
The other honest arguments for the pedal:
- DSP headroom. If your modeler patches are already maxed — and worship patches with two delays and a big reverb get there fast on an HX Stomp — an external shimmer box buys back processing for amps and drives where it matters.
- The infinite-reverb footswitch hold. A momentary freeze into an endless pad, on demand, is perfect for the quiet moment before a key change or under a spoken prayer. You can do it on a modeler with a snapshot and a long decay, but a dedicated footswitch is faster and more reliable mid-service.
- Pedalboard players. If your rig is an amp and a real board — which is still half the worship guitarists I know, and the whole premise of the worship pedalboard guide — then "your modeler already does it" is irrelevant. At $149 the Pico is a lot cheaper than a Strymon BigSky, and it fits a Pico-sized hole on a crowded board.
My Take
This is a well-judged release. EHX didn't just clone shimmer — they shipped three distinct ambient jobs in a tiny, affordable box, and the string-synth voice in Intergalactic is a real sound that's annoying to build anywhere else. But if you're a modeler player whose only goal is shimmer for builds, spend twenty minutes with the Glitz block and a parallel pitch path before you spend $149. Your Helix has been able to do this the whole time; the pedal's value is the synth engine, the DSP it frees up, and that footswitch hold — not the shimmer itself.
And whichever way you get there: shimmer serves the build, it doesn't make the build. If the congregation walks out humming your reverb tail instead of the song, the pedal won that round, not you.
Dig Deeper on Fader & Knob
- Build the full worship clean-to-lead patch on Helix in our worship guitar tone walkthrough.
- Stuck on an amp-and-board rig? The worship pedalboard guide covers where shimmer sits in the chain.
- Helix or Stomp for worship? We break it down in HX Stomp vs. Helix LT for worship.
- Want a flagship comparison instead of a Pico? See BigSky MX vs. Meris MercuryX.
- The shimmer-without-mud routing trick lives in parallel reverb routing and movement on the tail.
