Something That I Want To Acomplish

I have an issue, whether it’s feasible, one Nyquist-Plug-in Audacity use, to the following reach:

They created a Low pass filter w/ steep Damping out of for dynamic narrow Bandpass filter pick up the Overtones from Frequencies below the cut-off a while back. The
narrowband Filter would constantly in the Time move based onto the Content of the Sound source.

I think it should be one Cutoff or Damping the Overtone-pass effect for highly low source frequenies. And maybe would. Many Passes onto different Time Scale Resolutions contain.

Has someone already have something built or any Ideas, as it goes?

I’m sorry but I don’t understand your question.