I hope no one will deny the fact that there are two broad groups of people: one group is interested in sound correction based on a "push the button — get the result" principle, while the other group enjoys the very process of learning the correction procedure and carrying it out from start to finish on their own.
Initially, I wanted to follow the path of the second group. But I quickly realised that if I delved too deep into the subject, my brain might not handle it
So I decided to turn to "simpler" programs. To start with, I tried GSonic Reference, but nothing worked — on my operating system (Arch Linux), it was impossible to take measurements, the sound was extremely faint and heavily distorted (crackling).
Then I looked at DecayCore, but the first attempt didn't really work out.
After some time, I decided to try DecayCore again, and somehow it just fell into place. In the sense that it was more or less clear what to do (thanks to the reasonably clear DecayCore User Manual), and the measurements themselves were free of sound distortion. That seemed like a good sign.
At first, I didn't even pay attention to the quality of the measurements — I just wanted to figure out the program. I tried it one way, then another. When I felt ready, I carried out the measurements as carefully as my conditions allowed. The result was not a night-and-day difference compared to "before correction", but it was quite noticeable and acceptable to me. I shared the entire session data with the program's author, as he requested in
his post.
@VilhoValittu thanked me for it and, on his own initiative, offered some tweaks to my result. The sound became even better — the stereo panorama became more "focused", and the sound felt more "even" and "proper". I am quite satisfied with the result.
So, DecayCore is indeed capable of performing a reasonable correction through a fairly simple sequence of steps. And it seems to me that the result will satisfy a great many people.
After that, one can continue to explore the "heavyweight" programs in small steps, if they so wish
Once again, I want to thank
@VilhoValittu for this program! It is not perfect yet, but seeing how diligently the author is working on it, I am confident that it will only get better.