Key-pad compliance and leakage at a closed woodwind tonehole: MATLAB code and results

MATLAB implementation (R2026b, base MATLAB, no toolboxes) of the transfer-matrix model and closed-form perturbationrules of the manuscript "Key-pad compliance and leakage at a closed woodwind tonehole: closed-form perturbationrules verified by transfer-matrix simulation" (G. Husi, submitted to the Journal of Sound and Vibration), with allresult files (JSON, run log), the figure script, and an independent Python reference implementation with itsresults. The MATLAB results agree with the Python reference to a largest relative difference of 1.4e-10(compare_v5.txt). run_v5.m reproduces every number of Sections 3-4 and Tables 1-2 of the manuscript in about2 min; make_figs_v5.m produces Figs. 1-6.