Before the standardization of A=440 Hz in the 20th century, music existed in a rich landscape of tuning systems, each with unique psychoacoustic properties. Pythagorean tuning, based on perfect fifths (3:2 ratio), creates intervals that some researchers associate with enhanced spatial awareness. Just Intonation, using simple whole-number ratios, produces pure harmonics that can induce deep states of calm.
The controversial 432 Hz tuning, sometimes called "Verdi's A," is claimed by proponents to align with natural vibrations. While scientific evidence is still emerging, the mathematical elegance of these systems is undeniable — they connect to the same ratios found in the golden ratio, Fibonacci sequence, and sacred geometry.
Sonicrama's per-key Meta-Tuning lets you build and hear any of these systems — Pythagorean, just, 432-based — and watch what they do to the geometry.