When you load to the radio screen, use the tune up and tune down buttons << and >> in the popup menu and see if the station changes. Do this with and without the radio plugged in. It should work in both cases. If the radio is responding the "stereo" caption will come on and off as you tune to a station and away from it. Any errors with the identify function will be due to the stationlist file so make sure you have that setup correctly.
It must be 2 lines for every station
line 2: caption