Voodoo Lab"s Tremolo pedal delivers authentic vintage tube amp tremolo sounds from gentle and warm, to machine gun-style insanity all in a single pedal. By using the same lamp and photocell assembly found in many classic tube amps, Voodoo Lab"s Tremolo gives you real analog tone right from a compact 9V stomp box! By using the inventive Slope control, you can change the shape of the tremolo waveform from traditional to full on stuttering madness and all points in-between. Speed and intensity controls provide a wide range that includes very slow and deep sounds, and the Volume control lets you cut or boost the overall output to your amp.Authentic lamp and photocell tremolo circuit Slope control for waveform tweaking Ultra wide range of Speed and Intensity settings Compact, pedalboard friendly size True bypass switching with LED Runs on a 9V battery Hand built in the U.S.A. Five-year warranty