Gray noise sounds like a powerful waterfall in the distance. Gray noise is subjected to a psychoacoustic equal loudness curve over its entire range of frequencies. This psychoacoustic curve makes the noise sound equal to the human ear across all frequencies (the human ear perceives some frequencies as louder than others). Gray Noise is professionally mastered and included in the White Noise Pro app. The Gray Noise sound is also available for streaming and purchase at iTunes, Spotify, Google Play, Amazon, and other music stores.
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Learn more about the White Noise App