Morse code, welcome:
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High-frequency squeak, Low-frequency rumble
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Radio noise
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Radio Setup
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Interference Broadcasting
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Brown noise
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White noise
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Low frequency pulsing and humming signal
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Radar, location alert
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Morse code, SOS signal reception
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Low frequency electronic signal
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Morse code, welcome
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Horrifying throbbing low-frequency rumble
★★★★★