Your browser isn’t supported anymore. Update it to find the finest YouTube practical experience and our most recent functions. Learn more The A4 at 440 Hz is highlighted around the chart. For more geeking out, you may perhaps have an interest in this interactive comparison of equal temperament vs https://fr-quence-396-hz-bienfait27146.wikihearsay.com/3116450/getting_my_meditation_music_396_hz_to_work