Spotify in 432 Hz. Without converting a single file.

A concert pitch. It fixes where A4 sits, and everything else follows from it. The standard says 440 Hz; 432 Hz lies eight hertz below that, which is −31.77 cents, or just under a third of a semitone.

The Tuner shifts the whole sound by exactly that distance. It does not pick out single notes, and it changes nothing about the music except its pitch.

A randomised comparison of 432 against 443 Hz — that is, against the tuning today’s orchestras really play at. 43 people, each hearing both. At 432 the pulse fell by three beats a minute, at 443 by one. Pulse wave velocity fell only at 432. The difference between the two tunings held up statistically. The authors themselves write, though, that they cannot say whether this is down to the number 432 or simply to its being lower.

Aravena et al. (2020) compared 432 Hz, 440 Hz and silence before a tooth extraction; 42 people. For anxiety both music groups worked equally well — no difference between 432 and 440. The much-quoted cortisol finding does not survive a check against the full text: the 432 group started out at half the level of the others, and the change was not statistically sound in any of the three groups.

And what speaks against it, so you don’t hear it elsewhere first: these are small studies, no meta-analysis, no independent replication. In the same trial that measured the pulse, the psychological scores did not differ between 432 and 443. And Jebabli et al. (2025) found 440 better for an athletic warm-up.

What follows from that: something has been measured, and it is little. We promise you nothing. Until 01.09.2026 a cortisol figure stood here that we had taken from a study’s abstract. Checking the full text did not bear it out — and then you correct it instead of leaving it standing. The full texts are below under “What others write about it” — read them yourself instead of believing us. And then listen. The only measurement that counts for you, you make with your own ears.

No. The IYAMBAE Tuner is not a medical device, not a remedy and not a therapeutic instrument. It is a tool that shifts pitch.

It is not intended to detect, treat or alleviate any illness, and we claim that nowhere. If something is wrong with you, see a doctor.

528 Hz is not a concert pitch but a single note — roughly a C5. A concert pitch fixes A4, and everything else follows from it. The Tuner shifts the whole sound by an interval; it does not set a single note.

It can still be worked out: if you want your C5 at 528 Hz, you set A4 to 444.0 Hz — the slider can do that. At A4 = 432 Hz the same C5 sits at about 513.7 Hz.

About the Solfeggio series itself we say nothing. We know of no source on it that we could pass on here in good conscience, and so we claim neither that it does something nor that it does not.

macOS 14.4 and up — the complete app in the menu bar. Linux with PipeWire 0.3.60 and up — recently with a tray icon as well: pitches under their names, on and off, choice of engine, start at login. Underneath, a LADSPA plugin works in the filter chain. Demonstrated over D-Bus, the click measured: “Verdi tuning” → 432.331 Hz at the output device. Built for Debian 13; for Ubuntu and Zorin it has to be rebuilt.

Under GNOME the tray icon needs the AppIndicator extension once. The package recommends it, and the program says so at startup — instead of staying invisible and leaving the impression that nothing had been installed.

Windows: files yes, system audio not yet. There is its own window, a tray icon and an installer that needs no administrator rights. What it can retune there is files. Not the running system audio — the virtual output device for that is missing.

The reason for this order is technical: Windows lets system audio be listened in on, but not replaced. Anyone who wants to genuinely replace it has to become the output device. On macOS the capture interface does that; on Linux, PipeWire’s filter chain. On Windows it takes a virtual device — a driver of our own is the next step.

Because that is where the sandbox draws its line, not where the effort runs out. On iOS there is no counterpart in any form. On Android you may only capture someone else’s audio if the playing app permits it — and Spotify, Netflix and YouTube do not.

What would be possible is something else: a player of our own that takes the music in hand itself. That is being thought about.

Because a website has to guess and the app can measure. A page in the browser assumes the recording lies at 440 Hz, calculates the fixed factor 432⁄440 and applies it to everything. With a recording that lies at 443 — the value common in Germany today — you end up at 435 instead of 432.

The Tuner determines the actual tuning of the running sound and works out the distance to the target from that. What lies at 443 is shifted 443 → 432, not 440 → 432. And it reaches the system audio, not just one tab.

• 1.85 %That is how far the time-stretch factor is from unity. For an octave it would be 50 %.
• ±0 %The tempo stays. Simply playing back more slowly would turn 120 BPM into 117.8.
• 0.09 %of one core with the fast engine — 1077 times real time, measured on Windows.
• 0allocations in the real-time callback. Not claimed: the build script takes the DLL apart and lists every call that leads out. There are none.

Shifting pitch without touching tempo costs time — and how much depends on the method. You choose.

• 11 msDelay line. Fast enough for video and for playing along. The sound stays on the lips.
• 240 msHigh Quality (Signalsmith). Sounds better, but is useless with video — a quarter of a second of offset is visible.

The switch crossfades over 25 ms so that the change does not click.

If the Tuner is running on the same computer, IYAMBAE Radio can notice it and switch off its own guessing retune. Then the app that measures takes over.

You are asked twice in the process: the page asks once, and the Tuner asks you. Without your consent no website learns that you are using it — not even that it is installed. A list of permitted websites in the program code would have been more convenient. It would only have answered the wrong question.

This test release costs nothing. It asks for no account, no email address and no payment details — you download a file, and that is that.

Nothing has been decided about a price for a later, finished version. If that changes, it will say so here.

This page sets no cookies, measures nothing and loads nothing from other people’s servers. The fonts sit on the same server as the page — a link to a font collection in the USA would send your IP address there before you had clicked on anything.

The Tuner needs no account and sends nothing away. It processes the sound on the computer itself and records it nowhere. The only interface to the outside is the service for the radio on 127.0.0.1 — it does not leave your computer and answers only if you allow it.

The details are in the privacy policy.