Acoustic Guitar Body Helmholtz Resonance (A0) & Side-Soundport Shift Calculator

Deterministic Coupled 2-DOF Christensen-Vistisen guitar air-cavity + top-plate compliance Helmholtz eigenfrequency solver engine (.dxf, .json, .pdf) built for McPherson, Breedlove, Larrivée, Lowden — zero-upload ephemeral Wasm RAM execution.

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