window.AudioContext = window.AudioContext||window.webkitAudioContext;
audioContext = new window.AudioContext();

var compressor = audioContext.createDynamicsCompressor();
compressor.connect( audioContext.destination );

for( var i=0; i<30; i++ )
{
    var osc = audioContext.createOscillator();
    osc.frequency.setValueAtTime( 200 + Math.random()*200, 0 );
    osc.detune.setValueAtTime( Math.random()*20-10, 0 );
    osc.type = "sawtooth";

    for( var t=0; t<5; t++ )
    {
        if( Math.random() < 0.1 )
        {
            osc.frequency.exponentialRampToValueAtTime( 200 + Math.random()*200, t*2+Math.random() );
        }
    }

    osc.frequency.exponentialRampToValueAtTime( 75 * Math.floor( Math.random()*Math.random()*3 + 1 ), 18 );

    for( var t=0; t<15; t++ )
    {
        osc.detune.setValueAtTime( Math.random()*30-15, t*2+Math.random() );
    }

    var filter = audioContext.createBiquadFilter();
    filter.type = "lowpass";
    filter.frequency.value = 3000 + Math.random()*2000;
    filter.Q.value = Math.random()*2;

    var amp = audioContext.createGain();
    amp.gain.setValueAtTime( 0, 0 );
    amp.gain.linearRampToValueAtTime( 1, 5 + Math.random()*5 );
    amp.gain.setValueAtTime( 1, 22 );
    amp.gain.linearRampToValueAtTime( 0, 30 );

    var panner = audioContext.createPanner();
    panner.setPosition( Math.random()*2-1, Math.random()*2-1, Math.random()*2-1 );

    osc.connect( filter );
    filter.connect( amp );
    amp.connect( panner );
    panner.connect( compressor );

    osc.start(0);
    osc.stop(30);
}