function Loader(loadItem) {
		this.AbstractLoader_constructor(loadItem, true, createjs.Types.SOUND);

	}
Loader provides a mechanism to preload Web Audio content via PreloadJS or internally. Instances are returned to
the preloader, and the load method is called when the asset needs to be requested.

@class WebAudioLoader
@param {String} loadItem The item to be loaded
@extends XHRRequest
@protected