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Add filter to example
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src/main.ts
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src/main.ts
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import "./style.css";
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let audioCtx: AudioContext;
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let osc1: OscillatorNode;
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function start() {
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const startButton = document.getElementById("start");
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audioCtx = new AudioContext();
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const freq = 261.625565; // Middle C
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osc1 = new OscillatorNode(audioCtx, {
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const osc1 = new OscillatorNode(audioCtx, {
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frequency: freq,
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type: "sawtooth",
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});
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osc1.start();
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const vca1 = new GainNode(audioCtx);
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vca1.gain.value = 0.0;
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const adsr1 = new AdsrNode(audioCtx, {
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attack: 0.01,
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attack: 0.1,
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decay: 0.11,
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sustain: 0.0,
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sustain: 0.3,
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release: 0.1,
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});
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adsr1.start();
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adsr1.connect(vca1.gain);
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const vca1 = new GainNode(audioCtx);
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vca1.gain.value = 0.0;
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const filter = new BiquadFilterNode(audioCtx, {
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type: "lowpass",
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frequency: 500,
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Q: 10.0,
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});
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const vol = new GainNode(audioCtx);
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vol.gain.value = 1.0;
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adsr1.connect(vca1.gain);
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osc1.connect(vca1).connect(vol).connect(audioCtx.destination);
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osc1.start();
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osc1.connect(vca1).connect(filter).connect(vol).connect(audioCtx.destination);
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const play = () => {
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if (audioCtx.state === "suspended") {