Many of the frequencies described are available in the BetterSleep application to mix with other sounds or content material. The A4 at 440 Hz is highlighted on the chart. For additional geeking out, you would possibly have an interest in this interactive comparison of equal temperament vs just intonation https://music396hzfrequency92467.webdesign96.com/32785541/the-music-with-396-hz-diaries