The OCD pedal is the only pedal that uses 2 x Mosfets configured as hard-clipping to 'Voltage reference" instead of the usual way: to ground." The earliest OCDs used 2 x Mosfets plus 1 x Germanium diode, but very quickly these diodes became harder and harder to find, and they became expensive. Recently I stumbled across a reasonably large stash of the right kind of Germanium diodes so I ponied-up and bought all of them. So I decided to do a run of the ultimate OCD: a Custom Shop offering with a few circuit tweaks using 2 x Mosfets plus 2 x Germanium diodes, and one hell of a beautiful paint job... Metallic Teal with a chrome undercoat! This beauty morphs between blues and greens depending on the light and angle. And what would the ultimate OCD be without a Blue LED? The sound? Great definition, more tube-like feel, a bit wider dynamic range, more sustain, and a more focused single-note tone. And as with all Fulltone pedals... 100% Built in the USA. Parkway Music is an Authorized Dealer. Our shipments are always insured and packaged securely and professionally. All of our gear is fully inspected to meet our high-quality standards and checked over by in-house techs prior to shipping. Please feel free to reach out to us for more information!