A troll will sometimes say something like this, I never thought of it myself

I asked you to post information that I had repeatedly posted myself for my system.
But I don’t care at all, I’ll leave it at that.

My post #4

What does bad manners have to do with it?
Look through the forum, I asked for advice about sound in Firefox. With pure alsa, the sound was everywhere, except for the browser, which “did not see” the sound system. Either pipewire or jack was required.
I have 5 different computers at home with the same Linux and DE and the sound settings are different for everyone.

Have you tried it yourself?
You won't improve anything and you won't hear any difference from resampling your favorite Petrov.
Empty chatter.

No not like this.

The generally accepted approach in such cases is for the user to state the premises, check it himself and report his impressions.
Check your assumptions yourself and don’t hesitate to let us know about your result.

If you don't have the appropriate hardware, just compare the sound of two 48 kHz files, one original, the other resampled from a file with a different sampling rate.

And inviting others to check their toys is bad manners, I think so.

Instead of assumptions and fortune-telling, take it and listen. Not necessarily at a sampling frequency of 384 KHz; if there is an effect, it will be noticeable at any one. You can do this with any signal; with a rectangle it’s easier to hear.

How can you be left unattended?
You'll step on every mistake!

First, let's try to get at least some practical result from your idea and move from fortune-telling to facts.
To do this, you need to select the sampling frequencies available to your sound card. Then you can simply play them back and hear the difference. And you can make this accessible to everyone if you select 48 kHz and change it twice, to, for example, 192 and back to 48. Any card has 48 kHz and everyone can hear the differences.

And secondly, if you put in your own words all the mathematics that is crammed into the wiki article, then everything is simple. A rectangular pulse is the sum of an infinite number of sinusoids with all possible frequencies. But the upper frequency of the card is limited by its bandwidth (usually a little more than 20 kHz), so we get not a rectangle, but a trapezoid (we have a front with a non-zero duration) and a “comb”.

By the way, the number of harmonics will be determined by the selected pulse frequency and bandwidth; for 1 kHz and 20 kHz the upper one will be the 20th.
Therefore, the real signal at the output of the card will be different from the “virtual” one that the computer will show in gnuplot.

Have you ever heard this recording played from a gramophone record?
(Have you ever listened to vinyl?)

It's time to save you, your long-term struggle against pulseaudio is making itself felt. The contemplation of rectangles has now been added to writing out directions to the doctor.

What our posts have in common is that they have nothing to do with this forum itself, the forum of the Devuan distribution, and your links and advice on proprietary formats and paid resamples in no way correspond to Freedom Hacks, as I understand it.

P.S. I might add, your questions and my answers don't make much sense.

We need a point of reference, no matter how much I “sang Caruso,” if you haven’t heard Hi-End sound with a modified CD, with a sampling frequency of only 44.1 kHz, when “Valkyries really fly” and the performer can be “touched” in space, when you hear all 16 bits and the atmosphere of the hall, you simply have nothing to compare with. A regular computer, even at 384 kHz, is very far from this level.

You can play with Audiocity and copy links to commercial startups, but they have no practical meaning.

I don’t quite understand what’s causing all the noise?

You're all talking about these, of course not.