function stereo(sound_name, pan, id) {
	const sound = audioTracks[sound_name];
	if (sound && typeof sound !== "undefined") {
		return sound.stereo(pan, id);
	} else {
		throw new Error("audio clip " + sound_name + " does not exist");
	}
}
get or set the stereo panning for the specified sound.
@param {string} sound_name - audio clip name - case sensitive
@param {number} [pan] - the panning value - A value of -1.0 is all the way left and 1.0 is all the way right.
@param {number} [id] - the sound instance ID. If none is passed, all sounds in group will be changed.
@return {number} the current panning value
@example
me.audio.stereo("cling", -1);