The Keeley Bubble Tron is a Keeley flanger pedal, currently around $199. Close alternatives include the Baroni Labs Baroni Lab Miss Flanger and the Source Audio Hot Hand Phaser/Flanger. It pairs well with the Park P50 Classic and the Bad Cat Cub.

Keeley Bubble Tron

Keeley · pedal

The Keeley Bubble Tron is a dynamic flanger, phaser, and envelope filter that responds to pick attack, cycling only as you play. It offers three core voices, envelope filter, envelope flanger, and envelope phaser, each reacting to your dynamics, plus a Random Stepped Filter with proprietary synth-style bandpass shaping. The flanger draws on the MicMix DynaFlanger that Frank Zappa used for envelope-based flanging in his solos, and the pedal packs a deep eight-stage phaser for liquid, swirling tones. Depth and Sensitivity controls dial in the response. It excels for funk, where the envelope filter makes notes pop, and for expressive lead textures, delivering one of the better-regarded envelope filters in a compact, versatile enclosure.

What stands out

  • “The flanger draws on the MicMix DynaFlanger that Frank Zappa used for envelope-based flanging in his solos, and the pedal packs a deep eight-stage phaser for liquid, swirling tones”

    — from the listing

  • “The Keeley Bubble Tron is a dynamic flanger, phaser, and envelope filter that responds to pick attack, cycling only as you play”

    — from the listing

  • “It excels for funk, where the envelope filter makes notes pop, and for expressive lead textures, delivering one of the better-regarded envelope filters in a compact, versatile enclosure”

    — from the listing

  • “Its standout strengths are value, compact size, and the breadth of dynamic filter, flanger, and phaser sounds in one pedal”

    — from the community notes

  • “Depth and Sensitivity controls dial in the response”

    — from the listing

  • phaser
  • flanger
  • envelope filter
  • filter
  • dynamic
  • envelope
  • liquid
  • stage
$199View on Reverb

Price updated Oct 23, 2026

Genres the Keeley Bubble Tron is commonly used in

  • Funk
  • Soul
    citedInferred from shared tonal signals, not a stated genre tag.
  • New Wave
    citedInferred from shared tonal signals, not a stated genre tag.
  • Experimental
    citedInferred from shared tonal signals, not a stated genre tag.
  • Reggae
    citedInferred from shared tonal signals, not a stated genre tag.
  • Electronic
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Keeley Bubble Tron

Park P50 Classic

Park

28% match

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

Into a dynamic tone, Park P50 Classic brings a pull toward compressed that's missing

Comes later in the signal chain

Bad Cat Cub

Bad Cat

23% 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

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

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

Friedman Small Box 50W EL34 Amp Head

Friedman

tonal match

Comes later in the signal chain

Into a dynamic tone, Friedman Small Box 50W EL34 Amp Head brings a pull toward compressed that's missing

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

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

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

Pedals that stack with the Keeley Bubble Tron

Origin Effects RevivalDrive

Origin Effects

24% 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 earlier in the signal chain

Airis Effects SPEC-Defier

Airis Effects

23% match
$169via Reverb

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

Airis Effects SPEC-Defier 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

12% match
$281.42via 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.

Run JHS Lucky Cat Delay limited edition after Keeley Bubble Tron in the signal chain, where it won't crowd Keeley Bubble Tron — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Echoplex EP-3

Echoplex

11% 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.

Run Echoplex EP-3 after Keeley Bubble Tron in the signal chain, where it won't crowd Keeley Bubble Tron — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

MXR Badass Variac

MXR

tonal match
$154.99via Reverb

Comes earlier in the signal chain

MXR Badass Variac leans this dynamic tone toward compressed, which it doesn't make on its own

DigiTech DOD Compressor 280

Digitech

tonal match
$119.23via Reverb

Comes earlier 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
$95.94via Reverb

Comes earlier 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
$451.45via Reverb

Comes earlier in the signal chain

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

Cheaper alternatives

Catalinbread Many Worlds

Catalinbread

54% similarity
$163.66via Reverb

Shared character: phaser, pick attack, stage

Rotosound RKH1 The King Henry Phaser

Rotosound

52% similarity
$178.27via Reverb

Shared character: flanger, phaser, filter

Pigtronix Moon Pool

Pigtronix

52% similarity
$134.99via Reverb

Shared character: phaser, sensitivity, stage

Tone City Summer Orange

Tone City

51% similarity
$52.77via Reverb

Shared character: flanger, phaser, filter

Electro-Harmonix Andy Summers Walking on the Moon

Electro-Harmonix

49% similarity
$100.92via Reverb

Shared character: flanger, filter

Simple Sam Flanger-Roo Flanger

Simple Sam

46% similarity
$48.80via Reverb

Shared character: flanger, phaser, filter

Boutique & premium upgrades

Spaceman Aurora Analog Flanger Multi Mode Silver

Spaceman

45% similarity
$456.14via Reverb

Shared character: flanger, filter, stage

EarthQuaker Devices Pyramids Solar Eclipse Edition

EarthQuaker Devices

45% similarity
$301.29via Reverb

Shared character: flanger

Similar character

Baroni Labs Baroni Lab Miss Flanger

Baroni Labs

51% similarity

Shared character: flanger, filter

Source Audio Hot Hand Phaser/Flanger

Source Audio

49% similarity

Shared character: flanger, phaser

Spaceman Explorer 6-Stage Phaser

Spaceman

48% similarity
$249.95via Reverb

Shared character: phaser, vocal, stage

Alexander Dynaflanger Model 213

Alexander Pedals

47% similarity
$229via Reverb

Shared character: flanger, pick attack

BLAXX BX -Flanger

Blaxx

47% similarity

Shared character: flanger, compact, filter

Walrus Audio Lillian Multi-Stage Analog Phaser

Walrus Audio

45% similarity
$219.95via Reverb

Shared character: phaser, compact, vocal

See all alternatives to the Keeley Bubble Tron (cheaper + boutique) →

Questions people ask

What are good alternatives to the Keeley Bubble Tron?+

The closest matches in character are the Baroni Labs Baroni Lab Miss Flanger, the Source Audio Hot Hand Phaser/Flanger, the Spaceman Explorer 6-Stage Phaser. Budget picks: Catalinbread Many Worlds, Rotosound RKH1 The King Henry Phaser, Pigtronix Moon Pool. Boutique upgrades: Spaceman Aurora Analog Flanger Multi Mode Silver, EarthQuaker Devices Pyramids Solar Eclipse Edition.

What pairs well with the Keeley Bubble Tron?+

Strong matches from rig and tone-complementarity evidence: Park P50 Classic, Bad Cat Cub, Mesa/Boogie Stiletto Deuce Stage II — Into a dynamic tone, Park P50 Classic brings a pull toward compressed that's missing.

How much does the Keeley Bubble Tron cost?+

Around $199 (live listing price, updated Oct 23, 2026).

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