What a frequency actually is

A frequency measured in hertz (Hz) is simply how many times per second a sound wave repeats. 432 Hz means the air pressure around your ear rises and falls 432 times each second. That is the whole definition — everything else people attach to a number is interpretation.

Human hearing runs roughly from 20 Hz to 20,000 Hz, and the top of that range shrinks with age. The frequencies in this app sit between 50 Hz and 999 Hz, which is the region where tones are clearest and most comfortable to hold for a long session.

GSS plays sine tones: a single frequency with no harmonics. Music, voices and instruments are dozens of frequencies stacked together, which is why they feel busy. A sine tone gives your attention a single, unchanging thing to rest on.

That simplicity is the point. There is nothing for your brain to predict, track or anticipate, which is what makes steady tones easy to sit with for twenty or thirty minutes.

Specific frequencies gathered meaning through tuning debates, sound-bath traditions, spiritual practice and internet culture — not through clinical research. Those associations are real as culture and worth knowing, but they are not the same thing as a measured effect.

GSS keeps the two in separate boxes on every frequency page: what the sound physically is, and what tradition says about it.