ModKitsDIY The Trill Tremolo Effects Pedal Kit Build your own point-to-point tremolo pedal! The Trill tremolo pedal offers classic tremolo tones in an easy to build kit. The Trill's speed knob provides a wide range from a very slow to rapid fire effect. The depth knob varies the ratio between effected and dry signal. Using modern, low noise transistors makes operation of The Trill quiet with no signal drop when engaged. The Trill uses true bypass foot switching so it is out of the signal path when not engaged. All you need to provide is solder and tools! Uses 9 volt battery which is not included.