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Thread: Using envelope to control filter frequency

  1. #1
    Junior Member
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    Jan 2015
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    Using envelope to control filter frequency

    Hi everyone, first post

    just started out with the audio library (received the board today) and I am unsure how to use a ADSR envelope to modulate the filter frequency instead of the waveform amplitude?

    1. how do I connect the envelope to the filter?
    2. do I leave the envelope input open?
    3. a short code example would probably get me underway

    many thanks in advance

    Jan

  2. #2
    Senior Member PaulStoffregen's Avatar
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    Nov 2012
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    Perhaps something like this?

    Click image for larger version. 

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  3. #3
    Junior Member
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    brilliant. Didn't see the forest for the trees.

    I am really impressed with the teensy hardware, software and support, btw. Thanks for that!

  4. #4
    Junior Member
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    Oct 2017
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    Hi Paul,

    What tool is that you're using ? Is that Pure Data ?
    No version of Max or Reason looks like that, at least that I'm aware of.

  5. #5
    Senior Member oddson's Avatar
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    Feb 2013
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    Vancouver Canada
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    627
    That's the audio design tool
    https://www.pjrc.com/teensy/gui/

    It generates code to handle signal routing for the audio library

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