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Thread: LP filter : linking cut off frequency with note

  1. #1
    Senior Member
    Join Date
    Dec 2018
    Posts
    170

    LP filter : linking cut off frequency with note

    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

  2. #2
    Senior Member
    Join Date
    Apr 2019
    Posts
    174
    This is also known as keyboard tracking, it's discussed from #11 here: https://forum.pjrc.com/threads/67218...esonance-issue

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