0:31
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Test tone at 50 hertz or Hz
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0:31
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Test tone at 100 hertz or Hz
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0:30
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Test tone at 440 hertz or Hz
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0:30
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Test tone at 1000 hertz or Hz
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0:31
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Test tone at 30 hertz or Hz
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0:30
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Test tone at 500 hertz or Hz
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0:30
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Test tone at 250 hertz or Hz
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0:51
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Electric induction microphone - 60 Hz ground hum.
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