Internet Radio not streaming to airport express [Resolved]

Hello, added a radio station (great!).

I selected a zone that uses Airplay to stream to an airport express. The graphic equaliser animation on the zone window is going up and down but there is no sound coming out.

Streaming to the airport express via Tidal is no problem.

My set up:

Roon for Mac | OSX Yosemite | Airport Express v7.6.8 |

Sorry, should also add that the radio station plays with no problems direct to the core, where I have a Wadia DAC 121 connected.

Now working! Thanks