The Nelson Pass article where he describes his little harmonics generator goes a long way to providing a clue to the clue deprived. I'm glad Nelson is around as sort of an "anti Ted." Also, well said jnorris2005, as I utterly agree.
Could this be one reason tubes (and perhaps records) sound better?
This is not a new finding, rather it keeps cropping up in the hearing literature...
"White noise improves hearing":
https://www.sciencedaily.com/releases/2019/11/191112142926.htm
"White noise improves hearing":
https://www.sciencedaily.com/releases/2019/11/191112142926.htm