code: public static VAlarm audio(Trigger trigger, Attachment sound) {
  		VAlarm alarm = new VAlarm(Action.audio(), trigger);
  		if (sound != null) {
  			alarm.addAttachment(sound);
  		}
  		return alarm;
  	}
docs: Creates an audio alarm.
  @param trigger the trigger
  @param sound a sound to play when the alarm triggers
  @return the alarm