What is this (64070236)

✨ SIVANAT THISAWET

<head>
  	<title>
   	 wtf that noise
  	</title>
  </head>
<style>
      body {
        text-align: center;
        background-color:black;
      }
      button{
        border-radius:10px;
        padding: 15px 10px;
      }
      span{
        color:white;
      }
</style>
<body>
<span>Sound Check</span>
<br><br>
<button onclick="sine()">Sine</button>
  <button onclick="sawtooth()">Sawtooth</button>
<br><br>
<button onclick="osci.start()">
  play
</button>
<button onclick="gain.gain.value = 0">
  pause
</button>
<button onclick="gain.gain.value = 1">
  again
</button>
<input type="range" min="0" max="100"  value="1000" oninput="changef(value)">
<script>
  audio = new (window.AudioContext || window.webkitAudioContext)()
  osci = audio.createOscillator()
  gain = audio.createGain()
  osci.connect(gain)
  gain.connect(audio.destination)
  osci.type = 'sine'
  function changef(val){
    osci.frequency.value= (val);
  }
  function sine() {
		osci.type = 'sine'
  }
  function sawtooth() {
		osci.type = 'sawtooth'
  }

</script>
</body>