[LAU] Automated Music Mix Enhancement?

[hgn]

Hello,

let me start by saying that "learn how to do it properly" is always a 
good idea.  That said:

I am looking for programs, scripts, toolchains, command-line pipes etc. 
that one can use with a finished music project to further shape the 
sound.

A quick google search shows many online services that offer "instant 
mastering".  Also EQ-Presets from the last decades come to mind,  
noise-removal filters and simple plain old normalisation to get the 
volume up.

I am interested to gather all our collective knowledge on that to get 
some more or less automated, or at least very quick and efficient, 
options to quickly make a music file better. There are plenty of good 
reasons: It could be a work in progress where you want to create a low 
effort preview to send to a friend.  Maybe a real lack of 
mixing/mastering experience and subsequently a way to get some audible 
ideas. Or a plain "I normally only click export in Ardour and release, 
everything more would be an improvement".

I think programs could do a reasonable job at analyzing a piece of music 
and deciding what to change. Even without Deep Learning or A.I.s. Or 
with them.

Yours,
hgn