The Smac_fx_upgrade.rar file you have requested: Modifications / Sound Fixes / SMAc FX Upgrade - 959.08kb is not available. Perhaps try browsing all files for the game Alpha Centauri and upload any files you want to share or are missing. This is the only information we could locate:
Annoying and dull sounds of projectiles, aircraft, production complete and crash land sounds and most importantly explosion & battle sounds are changed.Try it, you will definitely see the difference. Here is a sound effects fix for Sid Meier's Alpha Centauri.