@cassanelligiovanni Filtering incoming audio to have ‘exactly’ what you want is hard live! Have you tried the patch you linked to on the Organelle? it might work!
(is this where you got it? Noise filter for microphone (Live Audio) | PURE DATA forum~)
You can also look at examples of filtering with high-pass or bandpass filters as shown here:
http://www.pd-tutorial.com/english/ch03s03.html
You can also track the volume of incoming audio with the env~ object…
Some information about externals on the Organelle here: