The pt1_aao_v18.zip file you have requested: Shadow of Chernobyl / Mods / Sound and Music / Ambient Audio Overhaul - 40.98mb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R. Shadow of Chernobyl and upload any files you want to share or are missing. This is the only information we could locate:
AAO v1.8 Part 1The purpose of this mod is to "pick up" where Sound Overhaul has left off,and further enhance the ambience and atmosphere of the zone by the addition of better quality, and more realistic ambient audio files.AAO v1.8 now includes dynamic environments, ever game level now has it's own "tone."