Electro Harmonix Eddy Vibrato/Chorus Effect Pedal

No one does bucket-brigade effects like Electro-Harmonix and with the
Eddy you get lush EHX vibrato and chorus in a compact, pedalboard
friendly package with unique control options. The Eddy gives you envelope and expression pedal control over modulation
rate and depth. That means you can control either with your playing
dynamics. Plus, if you plug in an EXP pedal, you can use it to control
the rate or depth at the same time.