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The built-in plugins had no subharmonic synthesizer. Subharmonic (`subharmonic`, Harmonic category, also offline as AudioSuite) adds the octave below a lower and an upper band of the input. The Range picks the two band frequencies (120-180, 80-120, 60-90 or 40-60 Hz). Each band band-passes the input at its frequency and multiplies it by a flip-flop that changes sign on every rising zero crossing, which moves the band an octave down at a level that follows the band. A direct band adds the input's own bass. Each band has a gain from -120 to +24 dB and a solo; a solo also mutes the dry signal. Drive raises the summed bands into one of six saturation characters, and HP and LP filters (5 to 1000 Hz, Q 0.1 to 5) shape the result. Below 50 % Mix the dry signal stays at full level, above 50 % the wet signal does, and Wet Solo mutes the dry signal. Input and Output run from -18 to +18 dB. The Total row in docs/plugin-parity.md now counts 25 processors and 3 instruments, the entries in the built-in registry, and its Instruments row lists `sampler` and no longer lists the Sampler as missing.