Used Keeley Bubble Tron Flanger Phaser Pedal

Step into the otherworldly realm of dynamic modulation with the Keeley Bubble Tron, a pedal that responds to your playing with animated flanger, phaser, and filter effects. Inspired by the MicMix DynaFlanger famously used by Frank Zappa, this unit is far from your average modulation box—it’s a reactive, expressive sound-sculpting tool for players who want total creative control.

Dynamic Flanger Mode
Unlike traditional flangers, the Bubble Tron’s flanger section only engages when you play—no background swoosh, just responsive, envelope-triggered motion. Switch between positive and negative feedback for either smooth or hollow tones, and dial in how wild or subtle the response with the Sensitivity and Depth controls.

Dual Phaser Operation
The DynaMoPhase section combines two phasers: one classic LFO-driven and one fully dynamic. The latter reacts to your pick attack to create immersive, watery textures that follow your playing. Turn off the LFO for a purely envelope-controlled phasing experience.

Random Synth Filter
For extra experimental fun, a random sample-and-hold filter mode adds bubbling, glitchy sweeps to your tone—ideal for synth-inspired chaos or vintage sci-fi flavor.

This unit is in very good condition with only light cosmetic wear and works perfectly. Whether you’re chasing Zappa tones or inventing your own, the Bubble Tron is a highly musical tool for inspired modulation.

Includes pedal only.