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The honest science

Some of what this practice rests on is well studied. Some of it is early and promising. Some of what you will read online about frequencies is simply not true. I will always tell you which is which.

Well supported

Slow breath and calm sound move the body toward rest

Slow breathing

A 2018 review of fifteen studies found that breathing slower than ten breaths a minute raised heart rate variability, a sign the body’s rest system is engaged, and that people felt more relaxed and less anxious. The authors call the evidence limited but consistent in direction. Every practice in the course is built on slow breath for this reason.

Music and stress

A 2020 review of more than a hundred randomized trials found that music reduced both the physical signs of stress, like heart rate and stress hormones, and how stressed people felt. Sound is one of the oldest ways humans have of calming each other down, and the research backs that up.

Promising, and early

Binaural beats and specific frequencies

Binaural beats

When each ear hears a slightly different tone, the brain perceives a slow beat between them. A 2019 meta-analysis of twenty-two studies of anxiety, pain, attention and memory found a moderate overall effect. But a 2023 review looked at the popular explanation, that the beat steers your brainwaves, and found the studies split: five supported it, eight did not, one was mixed. So binaural beats may help some people settle, and why is not settled. That is why the course uses them as one layer, never the whole practice.

Specific frequencies

A few small studies have looked at individual tones. Nine people listening to music at 528 Hz showed lower cortisol and tension than at 440 Hz. Small pilots of music tuned to 432 Hz found slightly lower heart rate and better sleep scores. These are interesting, and they are tiny. Most Solfeggio frequencies have never been studied on their own at all.

Each frequency page says exactly what is known about that tone, including when the answer is nothing yet.

Not supported

What I will not tell you

That 528 Hz repairs DNA. The idea comes from test-tube experiments published outside peer review. Nothing shows that listening changes the DNA of a living person.
That 963 Hz activates the pineal gland. No study has shown it.
That 432 Hz matches the Earth’s resonance. The Schumann resonance is about 7.83 Hz, and the numbers do not line up cleanly.
That the Solfeggio tones are an ancient scale rediscovered. The syllables come from an eleventh-century hymn, but the frequencies in hertz were published in the 1990s, found through numerology. Hold the origin story lightly and let your body judge the tones.
That any tone cures anything. This practice supports wellbeing. It is not medical or psychological care.

The map I use

Three states of the nervous system

The course begins with three states: safe and connected, mobilized, and shut down. That map comes from Stephen Porges’s polyvagal theory, and therapists use it widely because people recognize themselves in it straight away.

Some of the theory’s specific claims about the vagus nerve are disputed by other scientists, most fully in a 2023 critique by Paul Grossman. I use the three states as a practical map for noticing where you are, not as settled anatomy.

So why sound?

Frequency is not a fix. It is an environment.

Sound is one tool among breath, attention and repetition. The tone gives your body something steady to settle onto. The slow breath does much of the measurable work. Your attention notices the change, and repeating it daily is what teaches your body that settling is something it can do.

That is the whole method, and it is why the course is twenty-one days rather than one track.

Using sound safely

Headphones carry binaural beats; speakers do not. Keep the volume comfortable.
Never listen while driving or operating machinery.
If you have epilepsy, a hearing condition or a heart condition, or you are pregnant, check with your doctor before you begin.
Stop any practice that does not feel right for you.

Sources

The book, Frequency Shift, carries full notes and a bibliography for every chapter.

Let your body be the instrument. Let your experience be the data.

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