I traced the problem (at least on my installation) to using Cavalier889's wonderful SetKey utility (a version I used for SH3) to alter the SH4 commands.cfg for use with Shoot for inputting voice commands.
After successfully testing the radio as I mentioned above, I backed up commands.cfg and replaced it with the one I had saved before uninstalling so that I could use Shoot, and voila! No radio. Returned the unedited copy and the radio was back. So then I hand-edited the original in notepad, adding the keyboard shortcuts I used most often for Shoot, and they seem to work fine, as does the radio and gramophone.
So the only thing I can assume without carefully examing both original and SetKey's edited version of commands.cfg for anomolies, is that SetKey somehow adds or removes or otherwise edits the file in such a way that it causes the radio/gramphone interfaces not to work. Hand-editing however doesn't seem to reproduce the problem.
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