JS Canvas Web Audio API AUS DD Instrument Sample SRC

<button onclick="InstrumFx1();">FX</button>
<script>
function InstrumFx1(){
var i=0;
for(var i=0;i<5;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=85+i;
oscillator.start(i);
if (gainNode.gain.value==1){
gainNode.gain.value=0;
}else{
gainNode.gain.value=1;
}
gainNode.gain.value=i;
}
}
</script>