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Check if the chain is not too tight or worn out. If worn it is often doing "tooth claiming" and gets periodically tight changing noise pitch. Also try to see if wheel bearings are not getting noisy (especially front wheel).
If the noise is from air rushing over some parts in bike - look for dead end cavities - like missing plastic plug somewhere, check both handle bar ends, atc. Anything that could do "empty bottle in the wind effect.
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