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"CVC Productions: Thank you very much for the rapid service and excellent work in restoration of my January 16, 1949 Wilcox-Gay Corporation Coin Recordio-Gram and transcribing it to a current CD version. I cannot begin to tell you how thrilled I was to hear the very clear speaking and singing voice of my then 16 year old but now deceased wife. ..."

Bias beats

An audio frequency signal that may be created if two slightly different bias frequencies are combined. The audio frequency is the arithmetic difference between the bias frequencies.