This circuit is an original design designed to emulate vintage Sample-Hold Filters but with updated amentities that guitarists have come to expect. True bypass with an LED. When in bypass mode the oscillator is muted to prevent noise from entering your signal. Current IC designs provide the lowest noise possible. Runs on a single 9V power adapter (no batteries at the moment). Intensity, Filter, and Rate controls. The above design is the prototype, each pedal will be built to order so the appearance will likely vary.