285 Hz is the second of the extended Solfeggio tones added beneath the classic six; the tradition describes it as a tone of tissue and renewal. The same pitch turns up in Barbara Hero's isotope correspondences, a meeting of two very different systems on one frequency. It is used as a soft, restorative tone. The associations belong to the traditions that name it. As the Solfeggio set spread, two additional tones were placed below the original six to round the sequence into a fuller nine-note scale. They carry the same numeric signature as the rest and are described in the same tradition as grounding, foundational pitches rather than centres of the chakra ladder. Independent of any tradition, controlled clinical evidence that a specific frequency produces a specific health effect is limited and mixed. Auriviel presents these tunings as music and contemplative practice. This page is for general information and relaxation. Auriviel's frequency music is not medical advice, diagnosis, or treatment, and no health outcome is claimed. If you have a medical concern, please consult a qualified professional.