Yes, indeed there is radio.
Open the Guide, press the “+” button and you will see a selection of channel groups: “TV”,”HDTV” and “Radio”. This essentially determines which channels you can select (and see in the guide). Select “Radio”, and you can now play radio stations from the guide or by entering the channel number.
When you want to go back to TV, you’ll need to change the channel group again. Like a lot of things with the FVP-4000T, a bit clunky…
Hope this helps.