Sound.js
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Sound.js
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	/**
	* @requires javelin-install
	* @provides javelin-sound
	* @javelin
	*/


	JX.install('Sound', {
	statics: {
	_sounds: {},
	_queue: [],
	_playingQueue: false,

	load: function(uri) {
	var self = JX.Sound;

	if (!(uri in self._sounds)) {
	var audio = JX.$N(
	'audio',
	{
	src: uri,
	preload: 'auto'
	});

	// In Safari, it isn't good enough to just load a sound in response
	// to a click: we must also play it. Once we've played it once, we
	// can continue to play it freely.

	// Play the sound, then immediately pause it. This rejects the "play()"
	// promise but marks the audio as playable, so our "play()" method will
	// work correctly later.
	if (window.webkitAudioContext) {
	audio.play().then(JX.bag, JX.bag);
	audio.pause();
	}

	self._sounds[uri] = audio;
	}
	},

	play: function(uri, callback) {
	var self = JX.Sound;
	self.load(uri);

	var sound = self._sounds[uri];

	try {
	sound.onended = callback \|\| JX.bag;
	sound.play().then(JX.bag, callback \|\| JX.bag);
	} catch (ex) {
	JX.log(ex);
	}
	},

	queue: function(uri) {
	var self = JX.Sound;
	self._queue.push(uri);
	self._playQueue();
	},

	_playQueue: function() {
	var self = JX.Sound;
	if (self._playingQueue) {
	return;
	}
	self._playingQueue = true;
	self._nextQueue();
	},

	_nextQueue: function() {
	var self = JX.Sound;
	if (self._queue.length) {
	var next = self._queue[0];
	self._queue.splice(0, 1);
	self.play(next, self._nextQueue);
	} else {
	self._playingQueue = false;
	}
	}

	}
	});