# Load the sound from an asset file descriptor
	# this function is for advanced use
	private fun load_asset_fd(afd: NativeAssetFileDescriptor): Sound do
		var resval = nsoundpool.load_asset_fd(afd, self.priority)
		if  resval == -1 then
			self.error = new Error("Unable to load sound from assets")
			return new Sound.priv_init(null, -1, self, self.error)
		else
			return new Sound.priv_init(null, resval, self, null)
		end
	end