chebby:
If you don't have any other source then try plugging in an optical lead from your DVD recorder or Freeview/Sky box to your DacMagic and see what BBC radio sounds like (BBC R2, R3 & R4 will have the best quality.)
I've done just that with my Humax 9300T PVR to my Fubar 4, radio sounds great, particularly enjoying Radio 6, hope they don't shut it down.