JS Oscillator Web Audio API 2 Ch Mixer SRC

<body onload="testFunc()">Volume Control Via Audio API IN JS</body><p>

<script>

var i=0.6;
var x1 = document.createElement("METER");
x1.min=0.0;
x1.max=1.0;
x1.value=""+0.0;
x1.id='x';
document.body.appendChild(x1)
document.refresh();

</script>

</body>

<button onclick="gainNode.gain.value=gainNode.gain.value-0.1;
x1.value=gainNode.gain.value;
gainNode.gain.value=x1.value;"><</button>

<button onclick="gainNode.gain.value=gainNode.gain.value+0.1;
x1.value=gainNode.gain.value;
gainNode.gain.value=x1.value;">></button>

<button onclick="gainNode.gain.value=0.0;
x1.value=0.0;">0.0</button>

<button onclick="gainNode.gain.value=0.1;
x1.value=0.1;">0.1</button>

<button onclick="gainNode.gain.value=0.2;
x1.value=0.2;">0.2</button>

<button onclick="gainNode.gain.value=0.3;
x1.value=0.3;">0.3</button>

<button onclick="gainNode.gain.value=0.4;
x1.value=0.4;">0.4</button>

<button onclick="gainNode.gain.value=0.5;
x1.value=0.5;">0.5</button>

<button onclick="gainNode.gain.value=0.6;
x1.value=0.6;">0.6</button>

<button onclick="gainNode.gain.value=0.7;
x1.value=0.7;">0.7</button>

<button onclick="gainNode.gain.value=0.8;
x1.value=0.8;">0.8</button>

<button onclick="gainNode.gain.value=0.9;
x1.value=0.9;">0.9</button>

<button onclick="gainNode.gain.value=1.0;
x1.value=1.0;">1.0</button>

<script>

var audioCtx=new AudioContext();
var oscillator = audioCtx.createOscillator();
var oscillatorr = audioCtx.createOscillator();
var gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
var Outt=x.value;
var Freq = ("1.0"+x.value);
var Vol = "0.0";
gainNode.gain.value=parseFloat(""+x.value);
oscillator.type = 'sawtooth';
oscillator.frequency.value = Freq;
oscillator.frequency.value=Freq
oscillator.start();

</script>
  <body onload="testFunc()">Volume Control Via Audio API IN JS</body><p>

<script>

var i=0.6;
var x = document.createElement("METER");
x.min=0.0;
x.max=1.0;
x.value=""+0.0;
x.id='x';
document.body.appendChild(x)
document.refresh();

</script>

</body>

<button onclick="gainNode.gain.value=gainNode.gain.value-0.1;
x.value=gainNode.gain.value;
gainNode.gain.value=x.value;"><</button>

<button onclick="gainNode.gain.value=gainNode.gain.value+0.1;
x.value=gainNode.gain.value;
gainNode.gain.value=x.value;">></button>

<button onclick="gainNode.gain.value=0.0;
x.value=0.0;">0.0</button>

<button onclick="gainNode.gain.value=0.1;
x.value=0.1;">0.1</button>

<button onclick="gainNode.gain.value=0.2;
x.value=0.2;">0.2</button>

<button onclick="gainNode.gain.value=0.3;
x.value=0.3;">0.3</button>

<button onclick="gainNode.gain.value=0.4;
x.value=0.4;">0.4</button>

<button onclick="gainNode.gain.value=0.5;
x.value=0.5;">0.5</button>

<button onclick="gainNode.gain.value=0.6;
x.value=0.6;">0.6</button>

<button onclick="gainNode.gain.value=0.7;
x.value=0.7;">0.7</button>

<button onclick="gainNode.gain.value=0.8;
x.value=0.8;">0.8</button>

<button onclick="gainNode.gain.value=0.9;
x.value=0.9;">0.9</button>

<button onclick="gainNode.gain.value=1.0;
x.value=1.0;">1.0</button>

<script>

var audioCtx=new AudioContext();
//  var ctx=document.getElementById('audio');
 // ctx.type="mpeg"
  //ctx.src="test.mp3"
 // ctx.play();
var oscillator = audioCtx.createOscillator();
var oscillatorr = audioCtx.createOscillator();
var gainNode = audioCtx.createGain();
  var gainNode1=audioCtx.createGain()p;
oscillator.connect(gainNode);
  oscillatorr.connect(gainNode1);
gainNode.connect(audioCtx.destination);
  gainNode1.connect(audioCtx.destination);
var Outt=x.value;
var Freq = ("1133330"+x.value);
var Vol = "0.0";
gainNode.gain.value=parseFloat(""+x1.value);
 gainNode1.gain.value=parseFloat(""+x.value);


oscillator.type = 'sawtooth';
oscillator.frequency.value = Freq;
oscillator.frequency.value=Freq
oscillator.start();

</script>