function createCurve(amount) {
      var curve = new Float32Array(WS_CURVE_SIZE);

      var k = 2 * amount / (1 - amount);
      var x;

      for (var i = 0; i < WS_CURVE_SIZE; i++) {
        x = i * 2 / WS_CURVE_SIZE - 1;
        curve[i] = (1 + k) * x / (1 + k * Math.abs(x));
      }

      return curve;
    }
function createCurve(amount) {
      var curve = new Float32Array(WS_CURVE_SIZE);

      var k = 2 * amount / (1 - amount);
      var x;

      for (var i = 0; i < WS_CURVE_SIZE; i++) {
        x = i * 2 / WS_CURVE_SIZE - 1;
        curve[i] = (1 + k) * x / (1 + k * Math.abs(x));
      }

      return curve;
    }
function createCurve ( amount ) { var curve = new Float32Array ( WS_CURVE_SIZE ) ; var k = 2 * amount / ( 1 - amount ) ; var x ; for ( var i = 0 ; i < WS_CURVE_SIZE ; i ++ ) { x = i * 2 / WS_CURVE_SIZE - 1 ; curve [ i ] = ( 1 + k ) * x / ( 1 + k * Math . abs ( x ) ) ; } return curve ; }
http://stackoverflow.com/questions/7840347/web-audio-api-waveshapernode
http : // stackoverflow . com / questions / 7840347 / web - audio - api - waveshapernode