Check the listing for details. Keeley Bubble Tron Dynamic Flanger Phaser Pedal. Condition: New. Listed at 199.00 USD. Keeley Bubble Tron Dynamic Flanger Phaser Pedal Keeley's Bubble Tron is a dynamic Flanger/Phaser pedal draws on inspiration from the MicMix DynaFlanger for the flanger portion of the pedal, used most famously by Frank Zappa in the '70s and '80s, and does a great job at capturing that vintage dynamic flanger tone, meaning it starts and stops based on your pick attack. The DynaMoPhase section of the Bubble Tron features two phasers - one has an LFO, and the other is a true dynamic phaser that also starts and stops based on your pick attack. The Bubble Tron also features a filter, with a shape control that lets you contour the pedal's bandpass filter, and can produce some spot-on keyboard-like sounds. With its array of different Specs: -Phaser, Flanger, and Filter in one pedal -Random Stepped Filter -M-Style Synth bandpass -Bank A and Bank B options accessible via internal switch SKU: KBUBBLE