Frequently asked questions

Music tuned to 432 Hz is often described as calming: a sense of ease, slower breathing, an easier time falling asleep. Several pilot studies report a measurable drop in heart rate and blood pressure compared with 440 Hz, but sample sizes remain small and researchers call for larger clinical trials. 432 Hz is therefore a form of support, not a validated medical treatment.

440 Hz is the international tuning standard used by most modern orchestras and instruments since the 20th century. 432 Hz is an alternative tuning, slightly lower in pitch, often described by listeners as warmer, rounder, and more conducive to relaxation. The difference mainly comes down to the reference pitch of the note A (A4): an 8 Hz gap, imperceptible on its own but one that changes the overall color of a piece.

Some studies, notably among patients with sleep disorders, observed improved sleep quality after listening to music at 432 Hz, where 440 Hz showed no notable effect. Halte Sonore offers a dedicated "Sleep" intention, best played in the evening in a quiet environment, as a complement to — not a replacement for — good sleep hygiene.

Listening to music at 432 Hz is associated by many listeners with a sense of calm and a slower heart rate, two central mechanisms in stress regulation. Halte Sonore offers a "Relaxation" intention composed specifically with that in mind. For persistent or disabling anxiety, these compositions are support and do not replace appropriate care.

In 1881, Italian composer Giuseppe Verdi campaigned for the adoption of A tuned to 432 Hz, which he called the "scientific tuning fork". He was concerned about the steadily rising tuning pitch in orchestras of the time, a source of excessive vocal fatigue for singers. This standard also made C5 vibrate at exactly 256 Hz, a power of two often cited as a mark of mathematical "naturalness". Italy adopted it in 1884 for its military bands, before 440 Hz became the international standard over the course of the 20th century.

444 Hz is another alternative tuning, higher than the 440 Hz standard, often associated with a sense of energy and mental clarity rather than the deep ease sought at 432 Hz. Halte Sonore composes in both tunings depending on each piece's intention: 432 Hz for calm and sleep, 444 Hz for momentum and focus.

432 Hz is a global tuning: it shifts the reference pitch of the whole scale. 528 Hz belongs to the "Solfeggio frequencies", a series of nine frequencies each associated with an intention in certain traditions. The status of the two is worth being clear about: the first is a historically documented tuning choice, the second belongs to an esoteric tradition with no scientific validation. The two do not technically exclude each other, but they do not carry the same weight of evidence.

Halte Sonore offers two tunings: 432 Hz, for deep relaxation, sleep and easing tension, and 444 Hz, for momentum and mental clarity. Each piece is filed by intention (relaxation, sleep, meditation, momentum) to help you choose by what you need right now rather than by an isolated number.

Soft music, at a slow tempo and without abrupt changes in volume, can help soothe a baby — the 432 Hz compositions in the "Relaxation" intention suit this well, at very low volume. That said, an infant's crying signals a need first of all (hunger, nappy, tiredness, discomfort, pain): music is soothing support, not an answer to that need. For unusual, prolonged or unexplained crying, see a paediatrician.

Some listeners report relief from the tension associated with headaches after regularly listening to music at 432 Hz, probably linked to the muscular and nervous release it encourages. It is one possible support within a stress management routine, nothing more: frequent or intense headaches should be assessed by a health professional.

Sound therapy refers to the structured use of sound and music to support physical, emotional and mental wellbeing. It draws on antiquity — Pythagoras was already exploring the mathematical dimension of the "music of the spheres" — and took shape as a modern discipline in the 20th century, with music therapy organising in France in the 1970s. Halte Sonore follows a receptive approach: you listen to compositions written for a specific intention, with no musical participation on your part.

Vibration therapy refers to approaches where sound is felt by the body as much as heard: low instruments, bowls, or vibrating surfaces and devices in contact with the body. Halte Sonore is about listening rather than contact — but the cello's low register, very present in the compositions, is what comes closest through headphones. Clinical data on these approaches remain preliminary.

Music does not erase an emotion; it gives it room. A slow tempo slows the breath, a low timbre holds without pushing, a predictable structure lowers vigilance. That is the principle behind the Halte Sonore compositions: each is written for an intention — easing tension, supporting sleep, regaining momentum — rather than for a general effect. It remains support, not therapeutic care.

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Halte Sonore is a product published by Vejcorp (SAS, SIREN 103 112 140), registered in Corbeil-Essonnes, France. The compositions are written and recorded by Mathyas Voisin, musician and composer, who is also the company's president.