http://thx.onekb.net/

thx.js

mr = Math.random;
e = "exponentialRampToValueAtTime";
l = "linearRampToValueAtTime";
s = "setValueAtTime";
h = "frequency";
c = "connect";
ac = new(window.AudioContext||window.webkitAudioContext)();
d = ac.createDynamicsCompressor();
d[c](ac.destination);
var os = [];

for(i = 0; i < 30; i++) {
	v = 200 + mr() * 200;
	os[i] = o = ac.createOscillator();
	o[h][s](v, 0);
	o.detune[l](mr() * 20 - 10, 0);
	o.type = "sawtooth";
	f = ac.createBiquadFilter();
	f.type = "lowpass";
	f[h][s](v * 8, 0);
	f.Q.value = mr();
	for(t = 0; t < 10; t++) {
		if(mr() < 0.1) {
			v = 200 + mr() * 200;
			o[h][e](v, t + mr());
			f[h][e](v * 8, t + mr());
			}
		}
	v = 75 * Math.pow(2, Math.floor(mr() * mr() * 4));
	o[h][e](v, 18 + mr());
	f[h][e](v * 15, 18 + mr());
	for(t = 0; t < 15; t++) {
		o.detune[s](mr() * 30 - 15, t * 2 + mr());
		}
	a = ac.createGain();
	a.gain[s](0, 0);
	a.gain[l](0.1, 5 + mr() * 5);
	a.gain[s](0.1, 22);
	a.gain[l](0, 30);
	p = ac.createPanner();
	p.setPosition(mr() * 2 - 1, mr() * 2 - 1, mr() * 2 - 1);
	o[c](f);
	f[c](a);
	a[c](p);
	p[c](d);
	o.start(0);
	o.stop(30);
	}