Low-frequency rumble, high-frequency squeak:
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Radio noise
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Low-frequency rumble, high-frequency squeak
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Brown noise
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Horrifying throbbing low-frequency rumble
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Low frequency electronic signal
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Interference Broadcasting
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Reception, Morse code, transfer
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Radar, location alert
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White noise
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Morse code, SOS signal transmission
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Electronic signal, energy buildup
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Welcome, Morse code
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