Keeley Bubbletron Dynamic Flanger Phaser

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£199.00 (including VAT @ 20%)

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1 year warranty and 30 day money back guarantee included

1 year warranty and 30 day money back guarantee included

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Product Ref: 81067

  • Flanger & Phaser in One Compact Unit with Random Stepped Filter
  • Incorporates Signal Manipulation Techniques Used by Frank Zappa
  • Three Modes of Operation Including Filter, Phase & Flange
  • Responds to Your Pick Attack as You Play For Optimum Effect
  • Offers Both Positive and Negative Feedback with its FDBK Control

Keeley Bubbletron Dynamic Flanger Phaser

The Keeley Bubbletron Dynamic Flanger Phaser offers both flanger and phaser effect in one compact unit. Based on the legendary guitar sound of Frank Zappa, the Bubbletron is the ideal choice for any player wanting to capture that same tone. This versatile tool is equipped with dynamic flanging that is unique to your playing style, such as pick attack and strength. Players can benefit from a choice of two phasers including standard and DynaPhase for a truly creative sound. If that's not enough, the Bubbletron also features a vintage synth-style random stepped filter for perfectly shaping your unique sound. With its sturdy design, this pedal is the perfect addition to any pedalboard.

Product Ref: 81067

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Full Description

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The Legendary Frank Zappa

The late Frank Zappa was an American musician with a career that spanned more than thirty years in the 70s and 80s. His music played an influential part in jazz fusion, due to his unique sound and lyrics on controversial issues such as politics, structures and movements often humorous. Due to his unique sound and iconic status, Keeley decided to capture that same sound and make it available to Zappa fans. This pedal cleverly explores some of those same sounds from the past.


The Bubbletron takes its inspiration from the MicMix DynaFlanger which was famously used by Frank Zappa to achieve his iconic sound from the 70s and 80s, which featured a dynamic flanger effect to reach envelope based flanging in his solos. A dynamic flanger starts and stops based on your pick attack or envelope, and similarly to this, the Bubbletron uses your playing to start and stop the flanger.

Control Options

Unlike other flanger pedals on the market, the Bubbletron cycles its effect only when you play, and works in dynamic with your pick attack and strength. It also offers both positive and negative feedback with its FDBK Rate control, delivering a choice of sounds from a hollow tone, to a thicker, smoother sound. The Sensitivity control allows you to set how sensitive you want the flange effect to be, from a delicate strum to heavy fingerpicking. The Depth control allows you to control how deep you want the flanging effect to be.


The Phase section of the Bubble Tron features two phaser effects. One has an LFO that you set the speed of with the Rate Control and the other is a true Dynamic Phaser. It starts and stops based on your pick attack, and allows options for adjusting the Depth and Sensitivity, delivering a very watery sound based on your guitar’s signal.

Random Stepped Filter

Players can also benefit from the random stepped filter with proprietary M-Style Synth bandpass shaping, that allows you to control the different ramps or random nature of the pedal with the shape control option.


  • A Flanger and Phaser in one compact unit with random stepped filter
  • Incorporates signal manipulation techniques used by Frank Zappa
  • Three modes of operation including Filter, Phase and Flange
  • Responds to your pick attack as you play, for an optimum effect
  • Offers both positive and negative feedback with its FDBK control


  • Controls: Rate, Sensor, Depth and Level
  • Inputs: 1 x 1/4"
  • Outputs: 1 x 1/4"
  • Power Source: 9V DC power supply (sold separately)