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. Polarity Multiplier has two modes: A and B. In phase-multiplier mode, the full dynamics of the key signal are retained.
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