I enjoyed both articles very much. I’ll make a filter with a dip in the 3000Hz region and try it out. Here is a link on problems with digital audio and how they have pretty much been figured out, take into account the article is 12 years old and technology has been catching up.
https://www.soundonsound.com/techniques/digital-problems-practical-solutions
https://www.soundonsound.com/techniques/digital-problems-practical-solutions