https://robertkeeley.com/
The Keeley Bubble Tron Dynamic Flanger Phaser and Random Synth Filter has three modes of operation.
Here's Keeley Bubble Tron demo with Fender Rhodes electric piano.
Demoer: Lazar Novkov
Website: http://pedalsfusion.com/
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#KeeleyBubbleTron #FenderRhodesPedals #Zappa