I apologise if this question has been answered many times before - I could not seem to find an exact answer. I've just setup an AirPort Express with AirTunes music streaming from my Mac. Using the Remote app on my iPhone I can control music playback to my APX. My issue is that when I send a stream to the APX from another Mac in the house, this interrupts any playback on that Mac. Is it possibly to set this up to stream from a Shared Library available in iTunes on my Mac, so to not disturb regular playback? This works fine when I stream from one Mac to another using the Shared Library feature. Am I missing something, or is this just not possible?