In reply to:

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IIRC, there's some other capabilites as well - such as being able to broadcast extended textual data - but I'm not sure if that's ever used..

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It certainly is! And this being the wishlist forum, one thing I'd like is to be able to look at the RDS RadioText without switching from MP3 to radio, so I can find out what's on without interrupting playback only to find it's "The Archers" again . A bit like picture-in-picture on your telly.