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Secret sounds promotions haven't been used for a long time.
In the mid 1980s, 2GB's Kel Richards ran a secret sound which was the sound of a microphone rubbing against the presenter's beard.
In that case, there were no clues and the competition ran for several days.
Thank you,
Anthony, the cluse have been close to the face, Belfield, in the land of the Wangal and Darug peoples of the Eora Nation