This overdrive effects pedal features the specific three-knob tone circuit straight from the custom "Jimmy Page" model Hiwatt. Like most traditional amp EQ circuits, the knobs are interactive, meaning turning one can alter the behavior of the other. The magic is getting the Mid and Bass controls dialed in together. Tweak those until you get the right tone for your guitar and amp. You'll notice that the Treble knob is fairly subtle, adding a bit of bite as it is turned up. If you scoop the Mid and turn up the Bass however, the Treble knob will seem a lot more active. Limited Edition Mountain Edition Artwork. • MFSKU RAH Mountain • UPC 853710004482