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multimode output (LP/HP/BP/notch)
\n**Response**: $-12\\,\\text{dB/oct}$; warm, musical resonance; continuous mode morphing
\n**Implementation**: ZDF (zero-delay feedback) via trapezoidal integration — Zavalishin, *The Art of VA Filter Design* (2012), Ch. 4–5; $\\tanh$ saturation on the integrator states (not on a separate `drive` input — unlike the ladder filters in this repo, `oberheim` takes no `drive` parameter)\n\n```js\noberheim(buffer, { fc: 1000, resonance: 0.5, type: 'lowpass', fs: 44100 })\noberheim(buffer, { fc: 1000, resonance: 0.5, type: 'highpass', fs: 44100 })\noberheim(buffer, { fc: 1000, resonance: 0.5, type: 'bandpass', fs: 44100 })\noberheim(buffer, { fc: 1000, resonance: 0.5, type: 'notch', fs: 44100 })\n```\n\n**Circuit**: Oberheim SEM (1974), Two Voice, Four Voice, Eight Voice
\n**vs Moog/Korg**: 2-pole like Korg35 but true state-variable topology; LP/HP/BP/notch from one circuit; warmer resonance character\n\n| Param | Default | |\n|---|---|---|\n| `fc` | `1000` | cutoff frequency, Hz |\n| `resonance` | `0` | 0–1; damping R = 1 − resonance (inverted — resonance=1 gives R=0, max resonance); bandpass peak gain is exactly 1/(2R) |\n| `fs` | `44100` | sample rate, Hz |\n| `type` | `'lowpass'` | `'lowpass'`, `'highpass'`, `'bandpass'`, or `'notch'` |\n\nPass the same `params` object on every call to persist the 2 integrator states across blocks.\n\n**Use when:** multimode synth filter (LP/HP/BP/notch from one set of coefficients) with warm, musical resonance — mode-switch by changing `type` without recomputing coefficients.\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"}