Here is a sound mod that may be of interest to you, a ambitious mod that polishes and tweaks most all the audio files, here is a description;
To be more specific on what the mod does, for instance, loud audio on a nightclub will be still loud, but now can now listen what other people are telling you! Combat music is still loud either, less annoying because the difference between ambient music is now acceptable. This list of what I did is still pretty long and depends on each file but don’t forget that the purpose is more to make a proper audio mix than adding polka in the afterlife.