The product description describes how to use the pedal very well. It tells what each knob does to the frequency. I usually just play around with the knobs until I find the sound Im looking for. 3 knobs allows me to get more combinations and fine tune the output. The construction of the pedal is very nice. Its small and light and the metal exterior should hold up very well. My plugs fit nice and snug into the side of the pedal and I dont worry about them easily falling out or getting pulled out with a light, accidental pull.
As noted in the description, this pedal doesnt come with a power supply. I am using an old supply from an old electronic item that no longer works