AudioGraphBuilder.biquad() method
An RBJ biquad filter (the full cookbook), built against the stream’s rate. gainDb applies to the shelf/peaking shapes. Runtime-retunable via AudioGraphNode.setParams() (cutoffHz / q / db) — the live EQ tweak.
Signature:
biquad(input: AudioNode, opts: {
kind: "lowPass" | "highPass" | "bandPass" | "notch" | "lowShelf" | "highShelf" | "peaking";
cutoffHz: number;
q: number;
gainDb?: number;
}): AudioNode;