Hello Mark, I have a defective Maxon AD999, do you have any experience with this pedal/circuit. Problem - Barely audible delay, lots of white noise and artifacts sounding like a fuzz. Tried with several amps and the same problem. Bought used Sweetwater Gear Exchange. Seller listed the pedal as "Excellent"...hardly it is not functional and doesn't work as it should. Advice please, Robert in Kanata.