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by music cable, is this a separate feed independent from your Set Top Box (STB)?
I have standard phono leads connecting my STB to my Hi-Fi amplifier (not the tuner). Setting the digitial STB channel to the ntl radio station, I can then listen to radio when the amplifier is set to the phono lead connection. The TV doesn't have to be on for this. Changing radio channels is doen on the STB, not the hi-fi, thus decoding is STB, not Hi-Fi, and no DAB radio is needed.