This is the tremolo pedal from Donner Company with the name of Ripple, which is also a pure analog circuit tremolo pedal. And maybe it’s the smallest analog tremolo effect pedal ever. If you’re looking for tremolo tone, you could check out the Donner Ripple Pedal. With 100% pure analog goodness for guitar tone needs. Although Ripple has a small size, it is equipped with complete basic adjustment knob.