I got the files from the link below but my version of Marathon 2 has no tracks folder. Do they go in the Aleph One base directory? Or is there something else I need to do?
There is this option too, but it's a bad choice because the link is dead and Marathoner325 couldn't be bothered to update it:
Same with the MP3 format tracks: http://simplici7y.com/items/marathon-2-special-edition-soundtrack-in-mp3-format