0:05
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Hard rapid knocking on wooden door X2. Door rattles slightly
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0:01
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Knocking hard on glass window pane.
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0:04
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Knuckles rapping on glass window
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0:19
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Fingers rapping against a bamboo flute.
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0:15
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Rapping on an acoustic guitar body with ringing, long and tonal, key of E.
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