www.tunnelvisionmusic.com - This is the perfect preamp pedal. The Crackle Okay volume knob is a negative-feedback control styled after classic 60s recording console inputs. (They crackled when adjusted too.) Most vintage guitars suffer from steadily deteriorating magnets in their pickups, since permanent magnets arent really forever. The Super Hard-Ons input impedance is so high (5 Meg) that it refuses any current flow from your pickup... maintaining the most magnetic field around each ...