LP filter : linking cut off frequency with note

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emmanuel63

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Hello,

I am building a simple synth with a low pass filter. I don't know what is the rule to link to frequency of a played note with the cut off frequency of the filter.
I tried something very simple :

myLPfilter.frequency(note_frequency * FC_ratio);

With a FC_ratio range from 0.5 to 200, I have an acceptable result, but I doubt it is so simple...

Emmanuel
 
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