hey Sidspyker:
Soo my sound mod has been struck down because of accuse of copyright, but anyways... did you did exactly as the instructions said? after you've unzip the file you need to click the "Unpack.cmd" there it will unzip the sound files and then you move everything in the folder (sound folder, cvin.dll and sound.arc) to the game folder. This fixes some music that don't activate correctly some times (it's very minor but it's there) with the original sound of the steam copy, i have some parts of the game when it was supposed to play a music but it didn't. soo i was left playing for that part of the game without music. In my experience this happens late in the game.
hope that answers your question. Att:XcrysizZ