Thanks. With the help of Wikipedia I think that means doing a bit of programming. At present I am using TV sound so sync is perfect so it would seem regressive if I had to start using a different radio feed, if thats whats suggested. There are lots of outputs on the roon box: could there not be some input sockets as well?
I get the feeling that roon is a bit of a hobbyists experiment still in early development rather than a consumer product although it charges on the basis of it being the latter.