PEDAL OF TREMOLO Vintage-Flavored All-Analog Tremolo Pedal with 3-Knob Design and Seamless Morphing Between LFO Styles Versatile and authentic all-analog tremolo pedal. Classic 3-knob design allows you to control speed and depth Seamlessly morph between soft and hard LFO styles. True bypass for ultimate signal integrity. 9 V battery or the PSU-SB DC power supply (not included)