due to my understanding of p5js.org examples, applying envelope is just acceptable to an oscillator or a wave which has been made by p5js synthesizer itself, is it any possibility to apply an envelope function to a sound file like mp3 files?
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that is indeed possible,
with:
https://p5js.org/reference/#/p5.Envelope/setInput
example:
https://editor.p5js.org/kll/sketches/Z8H-Bu7Sq
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