The Electro-Harmonix Pico Swello is an Electro-Harmonix wah pedal, currently around $131.64. Close alternatives include the Emma DiscomBOBulator and the Electro-Harmonix Q-Tron Plus. It pairs well with the Bad Cat Cub and the Cornell Romany 10 Tweed 10 watt Tube.

Electro-Harmonix Pico Swello

Electro-Harmonix · pedal

The Electro-Harmonix Pico Swello is a compact auto swell pedal that slows the volume envelope of your playing to create smooth volume swells, working polyphonically so chords as well as single notes swell fully. Beyond classic violin like swells, it can generate envelope filter and wah like textures, big synth style pads, and even act like a compressor to soften picking irregularities. With simple controls in a tiny enclosure, it delivers expressive, ambient swell effects effortlessly. It suits ambient, post rock, cinematic and pedal steel style players who want hands free polyphonic volume swells, pad textures and attack smoothing in a space saving pedal without manually working a volume pedal.

What stands out

  • “The Electro-Harmonix Pico Swello is a compact auto swell pedal that slows the volume envelope of your playing to create smooth volume swells, working polyphonically so chords as well as single notes swell fully”

    — from the listing

  • “It is used for ambient violin like swells, synth pad textures and attack smoothing across ambient, post rock and cinematic styles, and even as a soft compressor”

    — from the community notes

  • “It suits ambient, post rock, cinematic and pedal steel style players who want free polyphonic volume swells, pad textures and attack smoothing in a space saving pedal”

    — from the listing

  • “big synth style pads”

    — from the listing

  • “ambient swell effects effortlessly”

    — from the listing

  • swell
  • compressor
  • smooth
  • envelope
  • synth
  • ambient
  • attack
  • envelope filter

Good for

  • Busking
  • Live
$131.64View on Reverb

Price updated Oct 25, 2026

Genres the Electro-Harmonix Pico Swello is commonly used in

  • Shoegaze
  • Post-Rock
  • Ambient
  • Funk
    citedInferred from shared tonal signals, not a stated genre tag.
  • Experimental
    citedInferred from shared tonal signals, not a stated genre tag.
  • Soul
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Electro-Harmonix Pico Swello

Bad Cat Cub

Bad Cat

22% match

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Bad Cat Cub leans toward harmonically rich, and that's a real, usable character to pair with

Comes later in the signal chain

Cornell Romany 10 Tweed 10 watt Tube

Cornell

21% match
$1465.52via Reverb

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Into a dynamic tone, Cornell Romany 10 Tweed 10 watt Tube brings a pull toward compressed that's missing

Comes later in the signal chain

Ceriatone British Style 2525

Ceriatone

tonal match

Comes later in the signal chain

Ceriatone British Style 2525 leans this dynamic tone toward compressed, which it doesn't make on its own

Vox AC30S1 OneTwelve 30W 1x12 Combo

Vox

tonal match

Comes later in the signal chain

Vox AC30S1 OneTwelve 30W 1x12 Combo leans this dynamic tone toward compressed, which it doesn't make on its own

Fryette Power Station 100

Fryette

tonal match
$1199via Reverb

Comes later in the signal chain

Into a dynamic tone, Fryette Power Station 100 brings a pull toward compressed that's missing

Kustom HV30 Tube

Kustom

tonal match
$234.02via Reverb

Comes later in the signal chain

Into a dynamic tone, Kustom HV30 Tube brings a pull toward compressed that's missing

Mesa/Boogie Stiletto Deuce Stage II

Mesa Boogie

tonal match
$1147.50via Reverb

Comes later in the signal chain

Into a dynamic tone, Mesa/Boogie Stiletto Deuce Stage II brings a pull toward compressed that's missing

Friedman PT-20

Friedman

tonal match
$1499via Reverb

Comes later in the signal chain

Into a dynamic tone, Friedman PT-20 brings a pull toward compressed that's missing

Pedals that stack with the Electro-Harmonix Pico Swello

Origin Effects RevivalDrive

Origin Effects

22% match

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Origin Effects RevivalDrive leans this dynamic tone toward compressed, which it doesn't make on its own

Comes later in the signal chain

J. Rockett Archer Ikon

J Rockett

21% match
$183.99via Reverb

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

J. Rockett Archer Ikon leans this dynamic tone toward compressed, which it doesn't make on its own

Comes later in the signal chain

JHS Lucky Cat Delay limited edition

JHS Pedals

10% match
$280.82via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

JHS Lucky Cat Delay limited edition's pristine voice goes after Electro-Harmonix Pico Swello in the signal chain — it's not there to compete with Electro-Harmonix Pico Swello's own smooth character — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Echoplex EP-3

Echoplex

10% match

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Keep Electro-Harmonix Pico Swello's smooth voice out front: Echoplex EP-3 goes after Electro-Harmonix Pico Swello in the signal chain so its analog warmth voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

DigiTech DOD Compressor 280

Digitech

tonal match
$118.97via Reverb

Comes later in the signal chain

Into a dynamic tone, DigiTech DOD Compressor 280 brings a pull toward compressed that's missing

DigiTech XBS Bass Squeeze

Digitech

tonal match
$95.74via Reverb

Comes later in the signal chain

Into a dynamic tone, DigiTech XBS Bass Squeeze brings a pull toward compressed that's missing

Fairfield Circuitry 20% More

Fairfield Circuitry

tonal match
$450.49via Reverb

Comes later in the signal chain

Into a dynamic tone, Fairfield Circuitry 20% More brings a pull toward compressed that's missing

Tech 21 CompTortion

Tech 21

tonal match

Comes later in the signal chain

Tech 21 CompTortion leans this dynamic tone toward compressed, which it doesn't make on its own

Cheaper alternatives

Electro-Harmonix Nano BassBalls

Electro-Harmonix

51% similarity
$73.13via Reverb

Shared character: single rig, wah, attack

Maestro Agena

Maestro

44% similarity
$59via Reverb

Shared character: attack, simple, response

Dunlop Cry Baby

Dunlop

42% similarity
$85via Reverb

Shared character: wah, attack

Dunlop Cry Baby GCB-95

Dunlop

41% similarity
$85via Reverb

Shared character: wah, simple, response

Donner Dynamic wah

Donner

93% similarity
$45via Reverb

similar tone character

Electro-Harmonix Micro Q-Tron Envelope Filter

Electro-Harmonix

92% similarity
$77.03via Reverb

similar tone character

Boutique & premium upgrades

Guyatone Wah Rocker WR3

pedal

52% similarity
$181.62via Reverb

Shared character: mono synth, wah, attack

Pigtronix Resotron Analog Tracking Filter

Pigtronix

50% similarity
$349via Reverb

Shared character: mono synth, wah, attack

Xotic Robotalk 1 New Old Stock

Xotic

42% similarity
$439.08via Reverb

Shared character: mono synth, smooth, response

Maxon AF-9 Auto Filter

Maxon

42% similarity
$263.27via Reverb

Shared character: controls, response

Ashdown Type 23 Three Band Filter

Ashdown

41% similarity
$242.79via Reverb

Shared character: attack, response

Ashdown Funk Faze

Ashdown

41% similarity
$172.30via Reverb

Shared character: wah, simple, response

Similar charactersee all similar tone character →

Emma DiscomBOBulator

pedal

58% similarity

Shared character: controls, each note, mono synth

Electro-Harmonix Q-Tron Plus

Electro-Harmonix

57% similarity
$162.08via Reverb

Shared character: mono synth, wah, response

Keeley Neutrino V2

Keeley

48% similarity
$166.47via Reverb

Shared character: wah, simple, smooth

Tycobrahe Parapedal Wah

Tycobrahe

44% similarity

Shared character: mono synth, wah, response

Behringer BM-15M Murf Box

Behringer

42% similarity

Shared character: mono synth, wah, ambient

Vox V863CA Auto Wah

Vox

42% similarity

Shared character: wah, simple, response

See all alternatives to the Electro-Harmonix Pico Swello (cheaper + boutique) →

Questions people ask

What are good alternatives to the Electro-Harmonix Pico Swello?+

The closest matches in character are the Emma DiscomBOBulator, the Electro-Harmonix Q-Tron Plus, the Keeley Neutrino V2. Budget picks: Electro-Harmonix Nano BassBalls, Maestro Agena, Dunlop Cry Baby. Boutique upgrades: Guyatone Wah Rocker WR3, Pigtronix Resotron Analog Tracking Filter, Xotic Robotalk 1 New Old Stock.

What pairs well with the Electro-Harmonix Pico Swello?+

Strong matches from rig and tone-complementarity evidence: Bad Cat Cub, Cornell Romany 10 Tweed 10 watt Tube, Ceriatone British Style 2525 — Bad Cat Cub leans toward harmonically rich, and that's a real, usable character to pair with.

How much does the Electro-Harmonix Pico Swello cost?+

Around $131.64 (live listing price, updated Oct 25, 2026).

Compare

Related searches