This update affects the titles Civilization IV and its expansion pack that includes Civilization IV: Warlords. The updates are totally free and are already available from the page: www.macgamefiles.com.
Civilization IV 1.61 Rev C is an update for the game that contains all previous game updates and is recommended for all users to install. With it, all the sound problems produced by the application of the previous update patch are resolved.
For its part, the update, Civilization IV: Warlords 1.0 Rev B, also corrects the sound problems caused by the application of the previous patch in the Civilization 4: Warlords update. At the same time it fixes more than 100 solutions for small errors, as confirmed by Aspyr.