Been out of the pso and mod loop a good year and a half, but basically theirs a obb or ogg file containing all the sounds, take whatever sound you want to add, rename it whatever your taking out, example wanna replace caves 2 sound with ABC's.... Rename ABC'S caves 2, paste into the obb or ogg folder, hit overwrite and bam done. Sorry so rough haven't fired this up in so long about to get back into it, and finishing some mods I started.