Just a comment – for InDesign-type work, I find something like Inkscape (or Scribus) easier to work with than LaTeX. I usually only use LaTeX for things where the layout needs to be pretty but not customized. Its possible to use it for design, but not a good use of time.
It’s possible that there’s a reason it requires lossless audio, in that it requires uncompressed signal to work. For instance, if the ML model is trained on uncompressed data, it may need audio which has never been compressed.