preloadFX: function ( id, assetPath, success, fail)
	params: ID - string unique ID for the audio file
			assetPath - the relative path to the audio asset within the www directory
			success - success callback function
			fail - error/fail callback function
	detail:	
			The preloadFX function loads an audio file into memory.  Assets that are loaded using preloadFX are managed/played using AudioServices methods from the AudioToolbox framework.   These are very low-level audio methods and have minimal overhead.  Audio loaded using this function is played using AudioServicesPlaySystemSound.   These assets should be short, and are not intended to be looped or stopped.   They are fully concurrent and polyphonic.
		
preloadAudio: function ( id, assetPath, voices, success, fail) 
	params: ID - string unique ID for the audio file
			assetPath - the relative path to the audio asset within the www directory
			voices - the number of polyphonic voices available
			success - success callback function
			fail - error/fail callback function
	detail:	
			The preloadAudio function loads an audio file into memory.  Assets that are loaded using preloadAudio are managed/played using AVAudioPlayer.   These have more overhead than assets laoded via preloadFX, and can be looped/stopped.   By default, there is a single "voice" - only one instance that will be stopped & restarted when you hit play.  If there are multiple voices (number greater than 0), it will cycle through voices to play overlapping audio.
	
play: function (id, success, fail) 	
	params: ID - string unique ID for the audio file
			success - success callback function - takes an integer (index of audio that has been played)
			fail - error/fail callback function
	detail:	
			Plays an audio asset - the index is only passed to success with assets loaded via preloadAudio
	
loop: function (id, success, fail) 	
	params: ID - string unique ID for the audio file
			success - success callback function - takes an integer (index of audio that has been played)
			fail - error/fail callback function
	detail:	
			Loops an audio asset infinitely - this only works for assets loaded via preloadAudio
	
stop: function (id, index, success, fail) 	
	params: ID - string unique ID for the audio file
			index - index of a specific audio voice to stop - pass -1 or null to stop all voices for the audio file.
			success - success callback function
			fail - error/fail callback function
	detail:	
			Stops an audio file - this only works for assets loaded via preloadAudio
	
unload: function (id, success, fail) 	
	params: ID - string unique ID for the audio file
			success - success callback function
			fail - error/fail callback function
	detail:	
			Unloads an audio file from memory

pause: function (id, index, success, fail) 	
	params: ID - string unique ID for the audio file
			index - index of a specific audio voice to pause - pass -1 or null to pause all voices for the audio file.
			success - success callback function
			fail - error/fail callback function
	detail:	
			Pauses an audio file - this only works for assets loaded via preloadAudio

setVolume: function (id, index, volume, success, fail) 	
	params: ID - string unique ID for the audio file
			index - index of a specific audio voice to set the volume on - pass -1 or null to set all voices for the audio file.
			volume - The volume between 0 and 1, inclusive, to set the volume to.
			success - success callback function
			fail - error/fail callback function
	detail:	
			Sets the volume for an audio file - this only works for assets loaded via preloadAudio

getDuration: function (id, success, fail) 	
	params: ID - string unique ID for the audio file
			success - success callback function - takes an integer that is the duration in milliseconds
			fail - error/fail callback function
	detail:	
			Gets the duration of an audio file - this only works for assets loaded via preloadAudio

getPosition: function (id, index, success, fail) 	
	params: ID - string unique ID for the audio file
			index - index of a specific audio voice to check
			success - success callback function - takes an integer that is the position in milliseconds. For audio that is not paused or playing, -1 is passed.
			fail - error/fail callback function
	detail:	
			Gets the position of an audio voice - this only works for assets loaded via preloadAudio

getCapabilities: function (success, fail)
	params: success - success callback function
			fail - error/fail callback function
	detail:
			Gets an object describing capabilities of the device as expected by SoundJS.
			See http://www.createjs.com/Docs/SoundJS/classes/Sound.html#method_getCapabilities