![]() A DC-offset switch corrects the input signal to improve tracking on rectified or offset signals.Since the peaks/crests of the sine(ish) waves of the filtered key signal slow their rate of change at the point where they begin to change direction, crossing at this point instead of at the quick zero-crossing of the original waveform results in smoother transitions with less harmonics. The signal is then flipped in polarity when the peaks hit zero. Here, the key signal is DC-offset so that negative peaks sit at zero amplitude. A different version of a flipper circuit is used for this mode. ![]() Mode B is a more complex circuit, and a more accurate simulation of the original Boss OC-2 pedal. This abrupt change in direction causes additional harmonics, and results in a brassy tone (although can be filtered out). Mode A (old version) flips the polarity of the key signal directly at the positive zero-crossings.
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