Low frequency electronic signal:
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Morse code, welcome
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White noise
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Radio Setup
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High frequency pulsating electronic signal
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Brown noise
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Low frequency electronic signal
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Low-frequency rumble, high-frequency squeak
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Energy buildup, Electronic signal
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Reception, Morse code, transfer
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High frequency signal
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Low frequency pulsing and humming signal
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Horrifying throbbing low-frequency rumble
★★★★★