pan(pval, tFromNow) {
    this.panner.pan(pval, tFromNow);
  }
Pan between Left (-1) and Right (1).
 See also: <a href="#/p5.SoundFile/pan">Pan Example</a>

 @method  pan
 @for p5.Oscillator
 @param  {Number} panning Number between -1 and 1
 @param  {Number} [timeFromNow] schedule this event to happen
                               seconds from now