Acoustic Piano String Inharmonicity (B-Coefficient) Analyzer & Custom Stretch-Tuning Chart

Deterministic Fletcher stiff-string partial dispersion f_n = n*f_0*sqrt(1 + B*n^2) estimation + psychoacoustic octave/twelfth beat-rate minimization engine (.wav, .pdf, .csv, .json) built for Steinway & Sons, Yamaha Pianos, Kawai, Reyburn CyberTuner — zero-upload ephemeral Wasm RAM execution.

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