For a month, 432 Hz in 67 MUSIC was a trick of speed. The player slowed each song down by about 1.8 percent, the way a record sounds on a slightly slow turntable, so the pitch dropped and the tempo dropped with it. Since 30 September 2026 it is a file: every song gets a real 432 Hz version next to the original, at the same tempo and the same length.

67 MUSIC is the music studio inside Shela, made by the studio that publishes SheAI News. The one tap 432 Hz mode has been on by default since 29 August. What changed at the end of September is how it is made and how far it reaches.

What changed

The 432 Hz version is tuned 31.8 cents below standard pitch, the gap between 440 and 432 Hz, while tempo, length and loudness stay the same. The original at 440 Hz is kept untouched. A new song gets its 432 Hz file a few seconds after it is made; older songs get theirs the first time they are played or downloaded.

The 432 Hz version is now the default wherever music in Shela is played or saved: the 67 MUSIC library, Explore, the chart, artist pages, share links and the lock screen player, the player in the chat, pages that Shela publishes, downloads in MP3 and WAV, and video exports. The soundtrack of Zora Savić's Sunce Moje video is the 432 Hz version of the song.

The old method could also shift a song twice. A track that had already been retuned by hand to 432 Hz was slowed again by the player and ended up near 424 Hz. Files that are already at 432 Hz are now never moved a second time.

How to get 440 back

One tap. The 432 button in the Now Playing view switches the device back to standard 440 Hz tuning, and the chat player, downloads and video exports follow that choice. The menu of every song also has a line that reads "Download original · standard tuning 440 Hz".

What the studies say, and what they do not

The about page calls 432 Hz a feature, not a cure: "432 Hz is not a medical claim. The studies (PMID 31031095, 32401941, 39844155) are small and the mechanism is not explained." Those three studies are worth reading for what they are.

In an Italian pilot study from 2019, 33 volunteers listened to the same film music on two days, tuned to 440 Hz one day and 432 Hz the other. Heart rate was on average 4.79 beats per minute lower with 432 Hz, at the edge of statistical significance (p = 0.05), and the authors asked for larger trials. A Chilean trial from 2020 with 42 dental patients found that music lowered anxiety before a tooth extraction at both tunings, while salivary cortisol was lower in the 432 Hz group (0.49 against 1.35 micrograms per decilitre). A German cross over trial from 2025 with 43 cancer patients compared 432 Hz with 443 Hz, the pitch of German orchestras, on a body monochord: heart rate fell with both, slightly more at 432 Hz, and heart rate variability rose only at 432 Hz.

The effects are small, the groups are small, and none of it proves that a pop song at 432 Hz is better for you. What the update does settle is a matter of taste: if you prefer the warmer, slightly lower sound, it now comes as a proper file that keeps the song's tempo, and if you do not, standard tuning is one tap away.