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music.\n\n**Circuit**: 4 cascaded one-pole transistor ladder sections, global feedback from output to input
\n**Implementation**: Zero-delay feedback (ZDF) via trapezoidal integration — Zavalishin, *The Art of VA Filter Design* (2012), Ch. 6
\n**Response**: $-24\\,\\text{dB/oct}$ lowpass; resonance peak at $f_c$; self-oscillation (sine wave) at resonance=1
\n**Nonlinearity**: $\\tanh$ saturation at input (transistor ladder characteristic)\n\n```js\nlet params = { fc: 800, resonance: 0.7, fs: 44100 }\nmoogLadder(buffer, params)\n\n// Self-oscillation — runs indefinitely from a single impulse\nlet silent = new Float64Array(4096); silent[0] = 0.01\nmoogLadder(silent, { fc: 1000, resonance: 1, fs: 44100 })\n```\n\n**Patent**: Moog (1965) US3475623
\n**vs Diode ladder**: Moog saturates only at input; diode saturates at each stage — different character at high resonance\n\n| Param | Default | |\n|---|---|---|\n| `fc` | `1000` | cutoff frequency, Hz |\n| `resonance` | `0` | 0–1; feedback k = 4·resonance; self-oscillates exactly at 1 |\n| `fs` | `44100` | sample rate, Hz |\n| `drive` | `1` | input gain into the tanh saturation; `0` mutes the signal |\n\nPass the same `params` object on every call to persist the 4 stage states across blocks.\n\n**Use when:** synth-filter warmth, resonance, and true self-oscillation at resonance=1 — the reference analog-modeled lowpass.\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"}