HowlerLoader.js

THREE.HowlerLoader = function(manager){
    this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
};


THREE.HowlerLoader.prototype = {

	constructor: THREE.HowlerLoader,
  load: function(url, onLoad, onProgress, onError){
      var scope = this;

      scope.manager.itemStart( url );

      var sound = new Howl({
        src: [url],
        onloaderror : function(){
          scope.manager.itemError( url );
        }
      });

      sound.once('load', function(){
        scope.manager.itemEnd( url );
        onLoad(sound);
      });
  }

};