Hi, I have a MacBook, iPad and iPhone and would like to play music from them on my stereo. Am I right in thinking that I can do this through airplay to an airport express? If so does it have to be the newer model AE or will it work with the older model (non N)? Also will the AE add to my existing network (Bt Homehub) to do what I want? I am a little confused with how this all works so sorry if I am asking silly questions.