Once you set up Zeppelin Air on the AirPlay, you can do all kinds of streaming sound from your iPhone/iPad/iOS devices to the Zepplin Air…
On your Mac (iTunes..)
And on your iPad’s Synology Audio Station (the app that is released by Synology to allow you to play music e.g. MP3, FLAC directly from the NAS)..
Apple own Music and Video Player on iPad
Third Party Music App e.g. Wall of Sound
Google YouTube :)
And my favourite.. radio music station via TuneIn Radio App to the Zeppelin Air :)
AirPlay AirPlay AirPlay Everywhere