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based upon an optical gain element that was ultimately rejected (and tucked away) due to its imparting of a sonic signature (i
and many more
RES3 and RES4) in phase and the NOTCH is a sum of filter1 (RES1) + filter 3 (RES3) in phase and filter2 (RES2) + filter4 (RES4) inverted
allowing any two OB-6s to be paired for twelve-voice polyphony
ZVEX Super Hard On TD-2A based upon an optical gainThis is the perfect preamp pedal. The "Crackle Okay" volume knob is a negative feedback control styled after classic 60's recording console inputs. (They crackled when adjusted too.) Most vintage guitars suffer from steadily deteriorating magnets in their pickups, since permanent magnets aren't really forever. The Super Hard On's input impedance is so high (>5 Meg) that it refuses any current flow from your pickup maintaining the most magnetic field
