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Improve note to frequency conversion #12

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4 changes: 3 additions & 1 deletion main4.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -155,7 +155,9 @@ namespace synth
switch (nScaleID)
{
case SCALE_DEFAULT: default:
return 8 * pow(1.0594630943592952645618252949463, nNoteID);
// n/12th root of 2 * A=440 where n is distance from A4 in semitones
// n = NoteID - 69 as A4 is midi note 69
return pow(2.0, 0.0 / nNoteID - 69) * 440.0);
}
}

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