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Sine Wave A 440 Hz Concert Pitch for Ten Hours
Stop your brain from overthinking. You don't need an app. Ten hour Sine wave with no overtones which is called pure as it is only the fundamental frequency.
This footage was recorded at the Seekonk Speedway in Massachusetts near the RI boarder. Described as extended moment photography the technique is not considered time-lapse film where time is condensed... flowers blooming,fruit rotting, city waking up... that sort of thing. This recording plays at real time speed. The footage is processed to extend the moment captured to show trails of where the animal has been / will be. By Dennis Hlynsky.