Human Whistling (Free Download Sound Effects) - YouTube
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Dog Whistle Sounds High Pitch! on the App Store
Freesound - "Slide Whistle, Descending, A.wav" by InspectorJ
Whistle, Referee, Short, 2, Long Sound Effect - Pro Sound Effects Suite MP3 download | Whistle, Referee, Short, 2, Long Sound Effect - Pro Sound Effects Suite Lyrics | Boomplay Music