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Guitar_Scale_Length_mm = 648;
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ln2 = ln(2);
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function log2(x) = ln(x)/ln2;
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function fret_scale_length(n) = Guitar_Scale_Length_mm * 2^(-n/12);
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function mm_to_fret_number(mm) = -log2(mm/Guitar_Scale_Length_mm)*12;
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function lerp(start, end, amount) = start + (end-start)*amount;
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