The Taff is a Hi-Fi optical tremolo with a very versatile wave selection. This pedal was designed with the thought of having a practical and useful, yet unique and inspiring trem effect. Like the other Dreadbox devices, it offers compatibility with expression pedals or CV input. The knobs will let you govern the Depth and Speed of the trem, Wave Selection, Wave Width, and initial VC Amp Gain. Not just designed for guitar, works beautifully with keyboards and other devices that provide a constant and steady tone. It's a true bypass circuit that is able to be ran with any standard 9V power supply.