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.

Small studies, mixed results, no meta-analysis, no independent replication — inconclusive. That is where it stands, and we report it in both directions without varnish.

Aravena et al. (2020) compared 432 Hz, 440 Hz and no music before a tooth extraction; 42 people in three groups. For salivary cortisol the 432 Hz group was significantly lower than both the others: 0.49 against 1.35 and 1.59 µg/dL. The authors conclude that 432 Hz is “effective in decreasing salivary cortisol levels”. On the anxiety scale, however, 432 and 440 did not differ — there, only music beat silence.

Other work answers other questions. Jebabli et al. (2025) measured the anaerobic performance of kickboxers during their warm-up; there 440 Hz came out ahead. That is a clean study — but anyone who wants to know whether music relaxes you while listening learns nothing from it.

What can be said from all this: that listening to music relaxes people is well documented. Whether it is down to the tuning is open. The full texts are below under “What others write about it” — read them yourself instead of believing us.

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.