Red Panda Particle 2: The Granular Delay That Turns Your Guitar Into Dust — And Then Puts It Back Together

There is a moment, the first time you plug into a Red Panda Particle 2, when your guitar stops being a guitar. You hit a chord and the sound arrives in pieces — some of them backwards, some of them an octave up, some of them arriving late and stuttering like a scratched CD in a 1997 Discman. Then you turn the CHOP knob a quarter-inch counter-clockwise and it reassembles into something almost beautiful: a shimmering, blurred halo behind your dry signal that no chorus, no reverb, and no delay pedal on earth makes.

That is granular processing, and for a very long time it lived only inside university computer-music labs and expensive laptop software. The original Red Panda Particle, released in 2011, was the first granular delay pedal ever built. The Particle 2 — the version you can still buy new today, at $329, from a four-person shop in metro Detroit — is what happened when its creator finally got a processor powerful enough to do what he’d wanted to do all along.

This is not a review. This is a gear guide: where the Particle 2 came from, exactly what every knob does, who has actually been photographed using one, what it does that its rivals cannot, and how to get musical sounds out of a machine that is fundamentally in the business of destruction.

Detroit, a List of 60 Pedals, and a Chip That Was “Too Damn Slow”

Red Panda began in 2009 as a hobby. Founder Curt Malouin — a software engineer working 60-to-80-hour weeks at a day job, who had started writing 6502 assembly at the age of ten and then spent fifteen years in C++ and Java — wrote himself a list of sixty pedals he wanted to build. A granular synthesis pedal sat at the top of it.

He built a bitcrusher and an octave/suboctave generator first, both as modules for the Line 6 ToneCore DSP Development Kit. In April 2010 he started on the granular delay, and the first job was picking a chip. He bought development boards and wrote a real-time granular synth on five different platforms: the DSP56K (already obsolete, kept purely as a reference), a SHARC, an Analog Devices SigmaDSP, an ARM Cortex-M4, and the Spin FV-1.

His work log from 29 April 2010 records the verdict: “The Spin FV-1 is too damn slow for a granular synthesis pedal.”

He used it anyway. Two months later: “I will do what I can with the FV-1, even though it isn’t much. Started a granular delay pedal tonight. Limitations force creativity.” He simplified full granular synthesis down to a delay with granular pitch shifting, random delay and time stretching, and squeezed it into 128 assembly-language instructions. The FV-1 has only three pot inputs, so blend and feedback had to be handled in the analog domain.

The chip choice matters historically. The FV-1 was designed by Keith Barr — the man behind MXR and Alesis — and shares a great deal with the custom DSP in classic Alesis reverbs. In 2010 the only pedal Malouin could find that used it was the Electro-Harmonix Holy Stain. The EarthQuaker Devices Dispatch Master arrived a few months before the Particle; the Rainbow Machine a few months after. In the decade that followed, the FV-1 became the engine of the entire boutique-DSP revolution. The Particle was standing right at the start of it.

The last piece fell into place on a lunchtime walk around the industrial park where Malouin worked. The FV-1 decrements its delay-line address counter by one each sample; to play the buffer backwards you manually add two per sample, cancelling the auto-decrement. He tried it the following weekend. His log, 9 January 2011: “Figured out reverse delay on the FV-1.” And because the Particle chops first and reverses second, it sounded nothing like a conventional reverse delay — each grain flipped or not flipped according to probability.

He drilled, painted, labelled, soldered and assembled the first batch in his garage and a spare bedroom, in July 2011.

What Actually Changed in the Particle 2

The Particle 2 arrived in 2019 and won Premier Guitar‘s Premier Gear award on a 4.8 score. It is not a facelift. It is a different machine wearing the same interface.

The V1 faked granular synthesis with clever tricks on a chip that couldn’t really do it. The Particle 2 runs a genuinely powerful processor and is, in Red Panda’s own words, “a full-fledged granular processor capable of generating dozens of simultaneous grains.” The list of what came with that: a smaller enclosure with all jacks on top; stereo TRS in and out; presets (4 on the front panel, 127 via MIDI); soft-touch switches; a momentary freeze footswitch; tap tempo with note divisions; higher sample rate, higher headroom, better signal-to-noise; improved pitch shifting; longer delay (up to 2,500 ms, against 900 ms on the V1); longer maximum grain size; more simultaneous grains; USB MIDI; a multi-purpose control port; USB firmware updates; and a free browser-based editor.

Firmware 2.2 then added another layer on top: mono or stereo input detection, random stereo panning, seven pitch quantization settings, and nine feedback types. This is a 2019 pedal that was still being materially improved years later — the same story as the Red Panda Tensor, which shares the platform.

Red Panda Particle 2 Specifications

The Eight Modes, Explained Properly

The MODE switch is the pedal. It doesn’t just change a sound — it reassigns what the DELAY/PITCH and PARAM knobs actually control. Everything else stays put: BLEND is wet/dry, FDBK is feedback, CHOP sets grain size below noon and the freeze threshold above it.

The five delay modes

DELAY + DENS — Delay knob sets time, Param sets grain density (the interval between grain onsets). Turn Param down and the audio breaks into blips. Turn CHOP and PARAM both up and the grains overlap perfectly. Set CHOP and DELAY to the same value with feedback cranked and you get VOSIM-style formant tones. This is the mode Premier Guitar called “probably the most utilitarian” — the one that produces “shimmering, blurry textures” that still sit under a normal chord progression.

DELAY + LFO — This is the time-stretch mode. DELAY sets the buffer length, PARAM steps a playhead through it. Noon is normal speed; below noon stretches; above noon compresses. Short delays give something like subtle phasing. Long delays give time-stretching, skip/repeat and what the manual cheerfully calls “glitchy robot sounds.” Use CHOP to trade artifacts against smoothness.

DELAY + REV — Reverse delay, but not the ordinary kind. PARAM sets the probability that each grain plays forward or backward: fully counter-clockwise is a true reverse delay, noon is a coin-flip per grain, fully clockwise is all-forward. CHOP sets the grain size and also imposes a minimum delay. Longer grains cut artifacts on sustained notes; very short grains give glitchy tremolo. The pro move: set DELAY and CHOP to the same tap-tempo note division for live reverse, or CHOP to a smaller division so the phrase rewinds in chunks.

DELAY + PITCH — Delayed signal jumps randomly up or down by the amount PARAM sets; CHOP controls how often the pitch changes. Untamed, this is percussive-parts-only territory. Quantized (see below), it becomes usable on almost anything.

DELAY + RND — DELAY sets a maximum delay time, PARAM sets the randomization range, CHOP sets how often the playhead jumps. Short delays produce a wide, unstable chorusing. Long delays produce beat-slicing. The manual’s own recipe: tap a whole note into DELAY and set CHOP to an eighth or sixteenth.

The three pitch modes

PITCH + DTUNE — Pitch sets the base shift, PARAM adds random detuning around it, CHOP decides whether the result is smooth or stepped. Small PARAM values give dual-oscillator-synth thickness; big values give pitch clouds. Two first-party recipes worth stealing: for organ, use zero detune, +1 octave, high feedback; for chorus/reverb, leave PITCH at noon, add a touch of detune, and wind FDBK up.

PITCH + LFO — PITCH sets the sweep range (an octave down to an octave up), PARAM sets the ramp rate. Because pitch is fixed for the duration of each grain, CHOP is the difference between a smooth glide and a stepped arpeggio. Feedback smooths it further.

PITCH + DENS — Fixed pitch shift, PARAM thins or thickens grain density, CHOP and PARAM interact so higher settings stack overlapping grains.

Chop, Freeze, and the Threshold Trick Nobody Uses

CHOP is a dual-purpose knob and this trips people up. Below noon it sets grain size. Above noon it stops setting grain size and becomes the freeze threshold. (If you want both independently, they’re separate parameters in the editor, in TouchOSC, or over MIDI — but moving the physical knob overwrites the editor value.)

Here’s what that threshold does, and it is the single most under-used feature on the pedal. Your signal passes through normally while its level is above the threshold. The moment it drops below the threshold, the Particle starts reading from the delay buffer instead. So it catches the front of every note and repeats it. Wind CHOP fully clockwise and it loops continuously. Set the threshold low and you get drones filling the gaps between notes, or tape-splice effects.

Holding the left footswitch gives momentary freeze — the bypass LED goes from blue to cyan. There are two freeze behaviours: grain freeze (default), which locks the buffer so you can scrub through it without degrading it, and delay freeze, which recycles the delay output into its own input the way the V1 did, so changing the delay time pitch-shifts and mangles the frozen loop.

Two tricks from the manual that are worth the price of admission on their own:

• Repeating what you just played. The Particle is always listening, even in analog bypass. Leave it bypassed with CHOP at 100% and DELAY set to the repeat length you want. Hit the ON footswitch and it enters freeze mode holding the last segment you played. You can capture a phrase you didn’t know you wanted to capture.
• Tap-then-hold. Because the left switch is both tap and freeze, you can set the freeze length on the fly in any mode: tap once, wait, then press and hold. The frozen segment’s length follows the tap division.

Feedback Is Not a Knob — It’s Nine Engines

Firmware 2.2 turned FDBK from a repeat control into a structural choice. The options: Recycle (output fed back into the granular engine, so pitch shifts stack for arpeggiator, shimmer and organ sounds — and so gaps between grains cause the signal to break into ever-smaller pieces and collapse); Recycle Ping Pong; Post Delay (a separate delay line so repeats decay smoothly without further granulation — best for clouds of detuned, randomly panned grains, and the setting that matches V1 behaviour in DELAY+DENS); Post Delay Ping Pong; Repeat # (each grain repeats 0–8 times); four probabilistic Repeat # / % variants at 50, 37, 25 and 12 percent; and Repeat %, where each grain repeats with a probability the FDBK knob sets — which at low settings is the best random-CD-skip generator in pedal form.

Red Panda’s documentation explains the probabilistic modes with dice. The pedal essentially rolls an eight-sided die each time it starts a grain and decides whether to play the stored repeating grain or the live input. That is not a metaphor for how it feels; that is literally the algorithm.

There is also a feedback lowpass filter — a tone control for the repeats — accessed by holding the right footswitch until the LED blinks and then turning FDBK. It’s stored in presets.

Pitch Quantization: The Update That Answered a Reviewer in Print

One of the better stories in modern pedal development. Reviewing the Particle 2 for Sound On Sound in November 2022, Paul White wrote that DELAY+PITCH’s random pitch jumps “often sounds unmusical on anything other than percussive parts,” and said he wanted the option to restrict random shifts to, say, octaves and fifths. He made the suggestion directly to Red Panda. Then, in his words, just before the review was due he was handed a beta firmware “and this includes all the pitch-quantising options I’d asked for as well as a few I hadn’t.”

The seven settings: Free (continuous, matches V1 and firmware 2.0–2.1); Semitones (±12, for dialling actual harmonies); Octave Up and Octave Down (unison-or-octave only, so randomization only ever adds octaves or suboctaves, with PARAM setting the probability); 5th & Octaves (unison, octave up/down, a fifth up, a fourth down — Red Panda’s own note says it “tends to always sound good,” which is the closest thing this pedal has to a safety net); Intervals (unison, minor third, major third, fourth, fifth, minor seventh, octave); and Intervals & Inversions (the same set upward plus their downward inversions).

If you have ever bounced off a granular pedal because the pitch content was atonal noise, this is the setting that fixes it. It is the difference between the Particle 2 being an experimental toy and a pedal you can use in a song.

Famous Players: Who Has Actually Been Photographed With One

House rule, applied here as everywhere: a dated photograph in a published rundown, a manufacturer artist page, or a direct interview quote. Anything less doesn’t make the list.

God Is an Astronaut — Torsten Kinsella and Jamie Dean (two Particles, one band)

The strongest single piece of evidence, and it’s a double. Premier Guitar‘s Rig Rundown with the Irish post-rock band, filmed at Windmill Lane Recording Studios in Dublin around the release of Ghost Tapes #10 and published by Chris Kies on 10 February 2021, documents a Red Panda Particle on both guitarists’ boards.

Torsten Kinsella’s left-side Pedaltrain Classic PRO carries it alongside a Strymon Mobius and BigSky, a Chase Bliss MOOD, a Moose Electronics HM23, a Boss DD-500, a Boss MT-2 Metal Zone, two black-Russian Electro-Harmonix Big Muffs, a Meris Hedra, Recovery Effects Bad Comrade, Dr. Scientist The Elements and a Chase Bliss Brothers. Jamie Dean’s Pedaltrain Terra 42 has one too, sitting in a comparable stack of Big Muffs, a Strymon TimeLine, another BigSky, another Hedra and a TC Electronic PolyTune 3.

The context is the story. This is the Rundown in which the band explain that they abandoned an Axe-Fx II rig — perfect for flying around the globe with a consistent sound — and rebuilt everything around amps and pedals during the COVID shutdown, because the traditional setup captured their dynamic range better. The Particle went into that rebuild deliberately.

Honest caveat: PG writes “Red Panda Particle” with no version suffix, and the shoot happened in early 2021, when both the V1 and the Particle 2 were in circulation. We are naming the pedal family, not claiming the V2 on this evidence. Neither Kinsella nor Dean currently has a GuitarGangsters guitarist page.

Jenn Wasner (Bon Iver, Wye Oak, Flock of Dimes) — on the record, in her own words

The only source in this list where the player explains why. Speaking to Guitar World in 2021, Wasner said she had “really attached to the Red Panda Particle, because it’s just such a bizarre crazy sounding pedal, it can do so many different weird things,” and mentioned pairing it with a Moog MS Drive for its extra tone control. Again: the family is named, not the version.

Justin Vernon (Bon Iver) — the i,i tour board

A Particle 2 documented as part of Vernon’s pedalboard for the i,i touring cycle, with Equipboard also crediting the pedal on the 2019 album itself. Two members of the same band running Particles independently is unusual, and consistent with what Bon Iver’s records actually sound like — a granular processor is very close to being the defining texture of that catalogue.

Ian Williams (Battles) — “Fort Greene Park”

Photographed on top of Williams’ synth rig, used for the delayed guitar parts on “Fort Greene Park” from Battles’ 2019 album Juice B Crypts. A source correction worth flagging: Equipboard files Williams under Don Caballero — a band he genuinely co-founded — while the usage note and the album credit both point at Battles. The gear evidence is sound; the band label is misleading. This is the second consecutive Red Panda SKU where Equipboard’s gear claim held up and its band attribution didn’t.

Mark Bowen (IDLES)

Visible on Bowen’s board during IDLES’ Lollapalooza 2020 livestream. A granular delay in a band that is mostly first-gear aggression is a genuinely interesting choice, and it’s audible in the way their cleaner passages smear.

Nick Reinhart (Tera Melos)

Demonstrated on camera in Perfect Circuit’s “SP404 Shreddin'” video at the 2:55 mark, with the guitar signal routed into the Particle 2 from a Source Audio C4 Synth. Note the routing: synth-processed guitar into granular delay, not the other way round. Equipboard files him under Death Grips, whose live band he has played in; he is far better known for Tera Melos, and the same misattribution was noted on the Tensor entry.

Also verified by photograph

• Martin Doherty — Particle 2 visible on his board in his own Instagram post. Equipboard lists him under The Twilight Sad; he is best known as a member of CHVRCHES, and was previously a touring member of The Twilight Sad. Treat the band label with the usual caution.
• Jake Luppen (Hippo Campus) — on his pedalboard in the band’s livestream.
• Jakob Bro — the Danish ECM jazz guitarist, Particle 2 on his Pedaltrain in a photo circulated by Jazz Pedalboards. A granular delay on a mainstream jazz board is the best single argument that this pedal is not genre-locked.
• Virtual Riot — producer, using the Particle 2 on camera at 3:55 in a YouTube studio video.
• Andrew Huang — visible in a posted studio video.
• David Hislop — listed on his own published gear page.
• A.A. Williams — Particle 2 credited on Songs From Isolation (2021).
• Love of Lesbian — credited on V.E.H.N. (Viaje épico hacia la nada) (2021).

The Noel Gallagher correction

Noel Gallagher is the most-followed name attached to this pedal in the aggregator databases, and the attribution needs unpicking rather than repeating. The photographic source is a Mix article about the recording of Who Built the Moon?, and the album credit filed alongside it is dated 2017.

The Particle 2 was released in 2019. A pedal cannot appear on a record made two years before it existed. Whatever is in that studio photograph, and whatever was used on Who Built the Moon?, it was a Particle V1, not a Particle 2. Gallagher reportedly owns over 300 pedals and demonstrably owns other delay-adjacent boxes, so the family attribution is entirely plausible — but the version and the album credit are not supportable, and every database that lists him under “Particle 2” has inherited the same date error.

The general rule, which costs nothing to apply: check the publication or release date against the product’s release date before you spend any effort on a claim. It kills more bad attributions than any other single check.

What we could not verify

Everything circulating via social-media board shots without dates, forum posts, and aggregator entries with no linked photo or video. That includes several names that appear on Particle lists elsewhere. We would rather publish eleven verified users and one honest debunk than thirty names we cannot stand behind.

Eight Tone Recipes

How It Compares

vs. the Red Panda Tensor. Same company, same platform, opposite philosophy. The Tensor manipulates a whole recorded buffer — speed, time-stretch, pitch, hold — and is fundamentally a time machine. The Particle chops the signal into grains and manipulates them individually. The Tensor is deliberate and performative; the Particle is textural and probabilistic. Players who own both, and there are several, do not consider them redundant.

vs. the Hologram Microcosm. The most common cross-shop. The Microcosm is a curated granular-looper with 44 preset algorithms, an onboard looper and a very high floor — it sounds finished the moment you switch it on. The Particle 2 is a granular engine with a lower floor and a much higher ceiling, and demands that you build the sound yourself. Buy the Microcosm for immediate results; buy the Particle for control. The same logic separates it from the Infinite Jets.

vs. the Chase Bliss MOOD MkII. MOOD is a two-channel micro-looper/granular hybrid built around the idea of a phrase you keep re-mangling. The Particle processes your live signal continuously. MOOD is a collaborator; the Particle is an effect.

vs. the Meris LVX or Eventide H90. Both those platforms include granular-flavoured algorithms among dozens of others, and both cost roughly double. If you want one box that does everything, buy the platform. If you want the granular sound to be immediately reachable with five knobs and a mode switch — because that is how you actually play live — buy the Particle.

vs. a conventional reverse delay. Red Panda’s own documentation draws the line: unlike the Raster 2’s reverse, the Particle plays back each grain in reverse, with the grains still in forward order. That is a different sound from a reversed buffer, and it is the reason the Particle’s reverse mode is usable at speeds where normal reverse delay turns to mud. Compare against a straight-ahead Dispatch Master or the EHX Canyon and the difference is immediately obvious.

vs. pitch pedals. It is not a tracking pitch shifter. A POG2, a Pitch Fork, a Whammy or the Eventide PitchFactor will give you clean, stable intervals. The Particle gives you clouds of grains at pitches chosen by probability. Different jobs entirely — though with quantization set to Intervals, the overlap is larger than it used to be.

Buying Guide

Is it still made? Yes. As of 2026 the Particle 2 remains a current Red Panda product at $329, listed in stock on the company’s own store, alongside the Bitmap 2, Context 2, Radius, Raster 2, RD-1 Pitch Delay and Tensor. The Particle V1 is legacy.

New vs. used. Used Particle 2 units trade meaningfully below list, and because firmware is user-updatable over drag-and-drop USB, a 2019 unit can be brought fully up to date — including all the pitch quantization and feedback modes described above, none of which shipped originally. There is no hardware revision to hunt for. Check the firmware version by holding the left footswitch while connecting power, then reading VERSION.TXT off the USB drive.

Watch out for V1s sold as V2s. The visual tell is unmissable: the V1 has jacks on the sides, the Particle 2 has all jacks on the top edge and a smaller enclosure. If a listing photo shows side jacks, it is the 2011 pedal.

Power. This is the single most common ownership problem. 250 mA at 9V, centre negative, no battery. Plenty of multi-pedal supplies rate most outputs at 100 mA and reserve one or two high-current outputs; some share current across outputs. If the pedal detects a supply problem, the bypass LED turns magenta, the pedal drops into bypass and low-power mode, and restarts after a few seconds. That magenta light is a diagnosis, not a fault — go find a proper isolated high-current output. The same warning applies to most of the digital boxes it shares a board with, including the Eventide Space family and the Source Audio Nemesis.

Who should not buy one. Premier Guitar‘s cons list was one line long and entirely fair: “Definitely not for-everyone.” If you want a delay that makes your existing sound slightly nicer, this is the wrong pedal and there are three hundred better options. The Particle 2 rewards people who want to be surprised.

Living With One

Set trails deliberately. Trails is off by default, and Red Panda explains why in the manual: some settings freeze indefinitely, which is confusing until you know the pedal. On startup, two long green blinks means trails off, four short blinks means trails on.

Learn the LED language. Blue is active, cyan is freeze, white is expert mode, blinking yellow means tap or MIDI clock sync is running, a green blink means a preset saved, magenta means your power supply is inadequate.

Leave expert mode off at first. In normal use, moving the MODE switch resets the previous mode’s parameters. In expert mode it reassigns the knobs without resetting anything, which is how you combine modes — a reverse delay with pitch density underneath it, say — but it also makes it very hard to find your way home. Red Panda’s own advice, and it’s good: keep expert mode off for live knob-twiddling and build one or two presets with it enabled, so you always have a predictable starting point.

Use the editor. It is free, browser-based (Chrome), talks to the pedal over USB, names and organises presets, downloads them as .syx files, and exposes every hidden parameter. Sound On Sound‘s verdict was blunt: “I highly recommend you exploit it.” Presets can also be downloaded from and shared to patchstorage.com, where there is a growing Particle 2 library.

Kill Dry for the studio. If you run parallel wet/dry chains or a mixer aux send, set bypass mode to Kill Dry: the dry signal is always muted, BLEND becomes an effect-level control, and you return the wet path however you like. Alternatively, Analog + FX Level keeps your dry signal on a unity-gain analog path with no converter latency at all.

The CTRL jack is a whole feature. Hold the right footswitch while plugging in an expression pedal, CV cable or remote switch, and the pedal configures the port for what you connected. The expression pedal can be assigned to up to six parameters at once, each with its own min/max range — including parameters belonging to a different mode than the one currently selected. That is the cheapest way to get a performable combination sound out of the pedal without touching MIDI.

Frequently Asked Questions