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Average Price: $174
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$60
$201+
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Based on price data from 5 merchants for "Keeley BubbleTron Flanger / Phaser". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
The Keeley BubbleTron Flanger/Phaser is a dynamic modulation marvel, inspired by the legendary soundscapes of Frank Zappa. This pedal isn't just an effect; it's a portal to the era of experimental rock and sonic exploration. At its heart lies the MicMix DynaFlanger, a tribute to the flanging technique Zappa popularized, which responds uniquely to your pick attack, creating a musical dialogue between your fingers and your pedalboard. The BubbleTron doesn't just cycle aimlessly; it dynamically flanges and phases only as you play, making it an extension of your creative expression.
Beyond its flanger capabilities, the BubbleTron features the DynaMoPhase—a dual-phaser system where one phaser is a traditional LFO-driven effect, while the other is a true dynamic phaser that reacts to your playing intensity. This dual approach allows for a vast array of watery and textured sounds. Plus, the Random Stepped Filter section introduces an element of unpredictability, with an M-Style Synth bandpass shaping feature that lets you craft keyboard-like tones with ease.
Whether you're a fan of Zappa or a guitarist seeking to push the boundaries of your sound, the Keeley BubbleTron is a versatile tool that encourages sonic experimentation and personalization.
Key Features:
- Dynamic flanger/phaser pedal with Random Stepped Filter
- Flanger inspired by the MicMix DynaFlanger used by Frank Zappa
- Dual phasers: standard LFO-driven and dynamic responsive
- M-Style Synth bandpass shaping for synth-like sounds
- Sensitivity, Depth, and Rate controls for tailored modulation
- Handcrafted in Edmond, Oklahoma by passionate Zappa enthusiasts
Product specs
| Pedal Type | Dynamic Flange plus Phaser |
| Analog/Digital | Digital |
| Inputs | 1 x 1/4" |
| Outputs | 1 x 1/4" |
| True Bypass | Yes |
| Power Source | 9V DC power supply (sold separately) |
| Power Usage | 65mA |
| Height | 2" |
| Width | 2.6" |
| Depth | 4.4" |
| Weight | 0.61 lbs. |
FAQs
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What makes the Keeley BubbleTron different from other flanger and phaser pedals?
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The Keeley BubbleTron features dynamic modulation, meaning it responds to your playing dynamics. This creates a unique, expressive effect that changes based on how hard or soft you play, setting it apart from traditional static modulation pedals.
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Does the Keeley BubbleTron work well with both clean and distorted tones?
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Yes, the Keeley BubbleTron is designed to enhance both clean and distorted guitar tones, providing dynamic modulation effects that add depth and movement to your sound regardless of your amp settings.
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Can the Keeley BubbleTron be powered by a battery?
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No, the Keeley BubbleTron requires a 9V DC power supply, which is sold separately, and cannot be powered by a battery.
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Is the Keeley BubbleTron suitable for live performances?
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Yes, the Keeley BubbleTron is suitable for live performances, featuring true bypass for maintaining signal integrity and a compact design for easy pedalboard integration.
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How does the Keeley BubbleTron handle signal bypass?
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The Keeley BubbleTron features true bypass, ensuring that your guitar's signal remains unaffected when the pedal is not engaged, preserving your tone.
Videos
Mike Hermans
Keeley BubbleTron Dynamic Flanger Phaser
Reviews
PROS
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Captures iconic Frank Zappa tones for fans of vintage guitar sounds
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Offers dynamic and traditional modulation settings for versatile sound exploration
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Combines flanger, phaser, and envelope filter in one compact unit
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Easily integrates with overdrive and fuzz pedals for expanded tonal options
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Internal switches allow for vintage and modern tone customization
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Provides rich depth and variety of modulation tones from just three knobs
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Ideal for both adventurous sound design and classic modulation effects
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Compact design replaces multiple pedals on a crowded pedalboard
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Highly recommended for creating unique, creative voicings
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Retro tones evoke 70s and 80s nostalgia effectively
CONS
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Internal dip switches require pedal disassembly for mode switching
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Default settings may not suit everyone's playing style immediately
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Lack of memory for saving preferred sound configurations
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Slight hiss noted when the pedal is activated
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No blend knob, only a level knob available for adjustments
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Keeley BubbleTron Flanger / Phaser.
Features and functionality
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The Keeley BubbleTron requires its level knob to be set around 4 o'clock to achieve unity gain, suggesting intentional volume control design.
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Internal dip switches for A-B mode switching are inaccessible during live performances, requiring pre-set adjustments before playing.
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The BubbleTron's dynamic phase and flange respond to pick attack, offering a unique initial rising wah sound, enhancing expressiveness in playing.
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The pedal offers a step filter mode, which is notably interesting when used in conjunction with looping devices like the 856.
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The BubbleTron's filter mode includes four stepped waveform options, offering a distinct modulation character compared to smooth waveforms.
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The flanger mode includes a negative feedback option, adding versatility and a unique sound that some users find essential in a flanger.
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Use cases and applications
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Works best placed at the front of the signal chain, similar to a wah pedal, to avoid dynamic maxing out in effects loops.
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Positioned after the Broadcast and before the Geiger Counter, the BubbleTron excels in capturing dynamic response effectively.
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The filter mode on the random setting with high sensitivity is favored for creating loops and experimental sounds.
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User experience
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The pedal offers distinct sound profiles between its A-side and B-side, appealing to both experimental and classic modulation enthusiasts.
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Some users find the filter mode unexpectedly appealing and end up using it more frequently than anticipated.
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Owners have noted a learning curve with the filter mode, which can initially seem incomprehensible, but further exploration reveals its potential.
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Comparisons
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Though more expensive than the MXR 95 and Small Stone, the BubbleTron offers broader modulation capabilities without unwanted noise.
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Unlike typical modulation pedals, the BubbleTron features a second bank switch for additional sound modes, though its internal location limits live use flexibility.
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Used With
Based on how musicians on Equipboard use Keeley BubbleTron Flanger / Phaser, it is most commonly used with the following gear.
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