Sound is air wiggling. Slow wiggles are low notes. Fast wiggles are high notes. We count the wiggles in one second. That count is Hertz (Hz).
A piano A is about 440 Hz. A low bass note can be near 110 Hz.
Open this on the device that is already making sound, including a phone on 5G. The page stays silent. Soft auto-gain lifts quiet rooms and headphone bleed. Tracks are density-clustered on the fly. No melody? It still draws voices and noise. It never fakes a tune.
Three layers, bottom to top:
Boom — the bottom. Left hand and bass.
Tune — the middle. The part you can hum.
Sparkle — the top. Extra shine and air.
The tool writes that recipe in Hertz. Then you can practice one layer at a time.
It is like reading a page someone is still flipping:
Many notes stack at once (chords).
Piano keys ring extra high copies called overtones.
The computer needs a little bite of sound before it can guess.
So the grown-up tool records, then looks. Tiny delay, better answer. The live page shows the messy moving picture so the delay makes sense.
If the loudest wiggle is 440 Hz, that is the A key. Find it. Play it. Match it. That is ear training: hearing a map, not a blur.
Grown-up CLI stays on a Mac. Public pages: English and French first. Source: GitHub · part of the Le Bonhomme Pharma family