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174

174 ñ Coin Tone Twist: A coin tone actually consists of two tones at two different frequencies that are played at the same time. Twist is the term used to indicate that one frequency is louder than the other. Normal twist is when the higher of the two frequencies is louder. Reversed twist is when the lower of the two frequencies is louder. Specifically, the two frequencies are: 2.2 KHz and 1.7 KHz.