@audio/effect-lofi

Lo-fi character — wow/flutter, vinyl noise, crackle, bandwidth ceiling (RC-20 class)

Wow/flutter via LFO-modulated fractional delay, tape saturation, a vinyl noise bed (hiss + sparse crackle), and a 3-pole lowpass ceiling / one-pole highpass floor. Noise is a seeded LCG — renders are deterministic and reproducible.

Install

npm install @audio/effect-lofi

Usage

import lofi from '@audio/effect-lofi'

let p = { wow: 0.3, flutter: 0.2, noise: 0.1, crackle: 0.1, lowpass: 6000, highpass: 60, drive: 0.3, fs: 44100 }
for (let buf of stream) lofi(buf, p)

lofi(data, params) mutates data (Float32Array/Float64Array) in place and returns it. Pass the same params object across calls — delay-line, LFO phase, filter, and noise state persist on it (_buf, _ph1, _ph2, _lp1..3, _hp, _rnd, _crk).

wow 0–1, slow pitch drift, ~0.7 Hz, up to 3 ms (default 0.3) · flutter 0–1, fast wobble, ~7 Hz, up to 0.4 ms (default 0.2) · noise 0–1, hiss bed level (default 0.1) · crackle 0–1, impulse density/level (default 0.1) · lowpass bandwidth ceiling, Hz, 3-pole −18 dB/oct (default 6000) · highpass rumble floor, Hz, one-pole (default 60) · drive 0–1, tape saturation, gain-compensated tanh (default 0.3) · fs sample rate · seed LCG seed for the noise/crackle generator

Use when: cassette/vinyl emulation, sampler character, retro texture Not for: transparent bandwidth reduction (use bitcrusher) or exciter-style HF recovery (use @audio/effect-sbr)

Part of @audio/effect.