JS Web Audio API FX 2

<button onclick="InstrumFx1();">FX</button>
<script>
var i=1.0;
function InstrumFx1(){
for(var i=0;i<555;i++){
var audioCtx=new AudioContext();
var oscillator = audioCtx.createOscillator();
var gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.gain.value=0;
gainNode.connect(audioCtx.destination);
oscillator.type='2';
oscillator.frequency.value=i;
oscillator.start(i);
gainNode.gain.value=i;
i+=1;
}
}
</script>