feat: add Filter FM (Devilfish mod)#35

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dfl wants to merge 3 commits intomidilab:developfrom

dfl:filter-fm-devilfish-mod

Commits on Dec 20, 2025

feat: add Pirkle diode ladder filter with filter type selection

dfl
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claude
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feat: add advanced TB-303 style nonlinearities to DiodeLadderFilter

dfl
and
claude
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Commits on Dec 27, 2025

feat: add Filter FM (Devilfish mod) - audio-rate cutoff modulation

dfl
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claude
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