I have a Freguson DAB dagital radioFRG/R121D
A high pitch alarm sound is on full time, I cant seem to get it to turn off, I have pressed all buttons and scroll, and turned it off and reset it, and the high pitch sound comes back, the radio is also playing under the sound, so its not just the sound of the high pitch alarm but the radio playing at the same time.

Berni NIRL, July 2011