How can I select multiple speakers connected to my AirPort Express® base stations?
This is possible via the AJAX Remote as well as via the on-screen context menu of the iTunes® Behaviour. In the AJAX Remote, enter the Music module, tap on “Speakers” in the bar at the bottom, then select “Multiple”. From now on, you can control whether iTunes® should playback your music via a speaker or not by tapping on it in the same place.
