unsupported audio formats

[vectorsize]

At the moment when loading an unsupported audio format the browser returns an error without any explanations, perhaps we can support that in the loader?

here's an example of how one can check the browser's capabilities:

var myAudio = document.createElement('audio'); 

if (myAudio.canPlayType) {
  // Currently canPlayType(type) returns: "", "maybe" or "probably" 
  var canPlayMp3 = !!myAudio.canPlayType && "" != myAudio.canPlayType('audio/mpeg');
  var canPlayOgg = !!myAudio.canPlayType && "" != myAudio.canPlayType('audio/ogg; codecs="vorbis"');

  console.log(canPlayMp3, canPlayOgg);
}