<script>
try{var r0=new AudioContext();}catch(e){}
try{var r32=r0.createOscillator();}catch(e){}
try{var r58=r0.createPeriodicWave(new Float32Array(1997),new Float32Array(1997));}catch(e){}
try{r32.start(0);}catch(e){}
try{r32.setPeriodicWave(r58);}catch(e){}
try{r32.frequency.value=-1;}catch(e){}
</script>