nigel I tried that also, since I still have an Ultra-doesn't want to save the channel because of the low-SR but it did store it. I don't get anything on the radio list for rtp, 12 radio channels for that sat, and when I leave it on TV and tried the audio button, it is does give me an option for Audio 2, which seems to be a radio or music channel.
Mine took a minute to show anything on the Audio button's option list, sometimes this ultra does that. (sometimes on AC3 channels, sometimes on reg audio too)
So, leave it on TV and try the audio button again , you may find that audio2 listed.