The Keeley Bubble Tron is a Keeley flanger pedal, currently around $169.15. Close alternatives include the Schulte Compact Phaser and the Walrus Audio Lillian Multi-Stage Analog Phaser. It pairs well with the Mesa Boogie Mark IIC+ Combo and the Friedman BE-Mini Head.
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.
- phaser
- flanger
- envelope filter
- filter
- dynamic
- envelope
- liquid
- stage
Price updated Aug 27, 2026
Genres the Keeley Bubble Tron is commonly used in
- Funk
- Soul
cited
Inferred from shared tonal signals, not a stated genre tag. - New Wave
cited
Inferred from shared tonal signals, not a stated genre tag. - Reggae
cited
Inferred from shared tonal signals, not a stated genre tag. - Experimental
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Keeley Bubble Tron
Mesa Boogie Mark IIC+ Combo
Mesa Boogie
18% matchMesa Boogie Mark IIC+ Combo leans toward high gain, and that's a real, usable character to pair with
Friedman BE-Mini Head
Friedman
tonal matchFriedman BE-Mini Head pushes a higher-gain pedal harder
Hughes & Kettner Warp 7
Hughes & Kettner
tonal matchHughes & Kettner Warp 7 pushes a higher-gain pedal harder
Synergy SL2 Module
Synergy
tonal matchSynergy SL2 Module pushes a higher-gain pedal harder
Hiwatt Hi-Gain 100W Head
Hiwatt
tonal matchHiwatt Hi-Gain 100W Head pushes a higher-gain pedal harder
Hughes & Kettner Coreblade
Hughes & Kettner
tonal matchHughes & Kettner Coreblade pushes a higher-gain pedal harder
Friedman Phil X Signature
Friedman
tonal matchFriedman Phil X Signature pushes a higher-gain pedal harder
EVH 000
Evh
tonal matchEVH 000 pushes a higher-gain pedal harder
Pedals that stack with the Keeley Bubble Tron
Wren and Cuff Box of War Small Foot Fuzz
Wren And Cuff
20% matchWhat Wren and Cuff Box of War Small Foot Fuzz brings here leans toward sustaining — that's worth building a pairing around
Greer Black Mountain
Greer
20% matchGreer Black Mountain's own fuzzy character is the real reason this is worth trying
Red Witch Titan
Red Witch
7% matchKeep Red Witch Titan after Keeley Bubble Tron in the signal chain, clear of Keeley Bubble Tron's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Boss DD-2 Digital Delay
Boss
7% matchRun Boss DD-2 Digital Delay after Keeley Bubble Tron in the signal chain, clear of Keeley Bubble Tron's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Cusack Music Carolina Reaper Overdrive Fuzz
Cusack Music
tonal matchCusack Music Carolina Reaper Overdrive Fuzz pushes a higher-gain pedal harder
Dr. Scientist Frazz Dazzler V2
Dr Scientist
tonal matchDr. Scientist Frazz Dazzler V2 stacks into a fuzz for tightened, sustaining gain
Crowther Prunes
Crowther
tonal matchCrowther Prunes stacks into a fuzz for tightened, sustaining gain
EarthQuaker Devices Dirt Transmitter
EarthQuaker Devices
tonal matchEarthQuaker Devices Dirt Transmitter stacks into a fuzz for tightened, sustaining gain
Cheaper alternatives
Similar character
Schulte Compact Phaser
Schulte
69% similarityShared character: flanger, phaser, modulation
Walrus Audio Lillian Multi-Stage Analog Phaser
Walrus Audio
68% similarityShared character: phaser, compact, vocal
MXR Flanger
MXR
67% similarityShared character: flanger, pedal, modulation
Catalinbread Many Worlds
Catalinbread
67% similarityShared character: phaser, pick_attack, stage
TC Electronic Stereo Chorus Flanger
TC Electronic
67% similarityShared character: flanger, pedal, modulation
Spaceman Explorer 6-Stage Phaser
Spaceman
66% similarityShared character: phaser, vocal, modulation
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 Schulte Compact Phaser, the Walrus Audio Lillian Multi-Stage Analog Phaser, the MXR Flanger. Budget picks: Tone City Summer Orange, Cordovox PH-8.
What pairs well with the Keeley Bubble Tron?+
Strong matches from rig and tone-complementarity evidence: Mesa Boogie Mark IIC+ Combo, Friedman BE-Mini Head, Hughes & Kettner Warp 7 — Mesa Boogie Mark IIC+ Combo leans toward high gain, and that's a real, usable character to pair with.
How much does the Keeley Bubble Tron cost?+
Around $169.15 (live listing price, updated Aug 27, 2026).