Sine wave (975Hz):
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The noise of the elevator, knocking
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The receptionist trolley passes by
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Wooden whistle
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Items fall on the carpet.
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Blow into the microphone
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Robot heartbeat
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The noise of the refrigerator room
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Closing the umbrella, Opening
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Pull telescopic antenna
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Parachute deployment
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Cup breaks, pot, Piggy bank, plate
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Tile falls
★★★★★