If you're referring to the RIAA equalization curve[1] that is completely open and well defined.
This occurs in the digital world as well. When we went to DVDs, the studios had encoders/authoring engineers, who tweaked compression parameters per scene, as compression is another non-linear process. For example, they might apply a small amount of blur on a dark scene where film grain trips up the compression.
Eta: Apple provides the exact pipeline [1] they use for their services so the sound engineer can listen to the output and adjust.
[1] https://www.apple.com/apple-music/apple-digital-masters/