5-String Banjo Head Tap-Note (G# / A) to DrumDial Tension & Coordinator-Rod Action Tuner

Deterministic Circular clamped membrane Bessel-function J_0/J_1 modal eigenfrequency separation -> isotropic surface tension N/m calibration engine (.wav, .pdf, .json) built for Deering Banjos, Gibson Mastertone, Remo Weatherking, DrumDial — zero-upload ephemeral Wasm RAM execution.

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