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\n**Response**: $-12\\,\\text{dB/oct}$; resonance 0–1 adds damping/saturation character — no resonant peak, no self-oscillation at any setting (2 real poles in the loop can't reach the −180° phase Barkhausen's criterion needs at any finite, audible frequency, unlike Moog/Diode's 4-pole loops)
\n**Complementarity**: LP+HP=input holds exactly only at resonance=0 (verified to 1e-16); at resonance>0 the HP tap's extra feedback term makes LP+HP diverge from the input (measured −7.5 dB to +1.4 dB error at resonance=0.8 across 200 Hz–5 kHz)\n\n```js\nkorg35(buffer, { fc: 1000, resonance: 0.5, type: 'lowpass', fs: 44100 })\nkorg35(buffer, { fc: 1000, resonance: 0.5, type: 'highpass', fs: 44100 })\n```\n\n**Circuit**: Korg MS-10/MS-20 (1978)
\n**Analysis**: Stilson & Smith, \"Analyzing the Korg MS-20 Filter\" (1996); Zavalishin, *The Art of VA Filter Design* (2012), Ch. 5
\n**vs Moog ladder**: 2-pole ($-12\\,\\text{dB/oct}$) vs 4-pole ($-24\\,\\text{dB/oct}$); Korg35 has both LP and HP taps from one circuit, but no self-oscillation\n\n| Param | Default | |\n|---|---|---|\n| `fc` | `1000` | cutoff frequency, Hz |\n| `resonance` | `0` | 0–1; feedback k = 2·resonance; never self-oscillates |\n| `fs` | `44100` | sample rate, Hz |\n| `drive` | `1` | input gain into the feedback-path tanh saturation |\n| `type` | `'lowpass'` | `'lowpass'` or `'highpass'` |\n\nPass the same `params` object on every call to persist the 2 stage states across blocks.\n\n**Use when:** MS-20-style aggressive filter character with a highpass tap available; use `moogLadder` for 4-pole warmth and true self-oscillation instead.\n\n---\n\nPart of [@audio/filter](https://github.com/audiojs/filter) — the filter family umbrella. This README is generated from the umbrella docs.\n\nMIT © [audiojs](https://github.com/audiojs)\n","readmeFilename":"README.md"}