The Keeley BubbleTron is a dynamic flanger, phaser, and synth filter inspired by Frank Zappa’s unique soundscapes. The flanger section is mostly Zappa-inspired, based on the MicMix DynaFlanger he used in the ‘70s and ‘80s. The DynaMoPhase section of the BubbleTron features two phasers—one true dynamic phaser that starts and stops based on pick attack strength and one LFO with speed determined by the rate control. If you’re looking for a Zappa fan looking for a super sculptable modulation effect, the BubbleTron is right for you.