<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
var ac = new window.AudioContext();
var delay1 = ac.createDelay(0.02);
var delay2 = ac.createDelay(0.002);
var source = ac.createOscillator();
source.start(0);
source.connect(delay1, 0, 0);
delay2.connect(delay1, 0, 0);
delay1.connect(delay2, 0, 0);
</script>
</head>
</html>