Aspyr Media on Monday said that later this week it will release a free patch for the Mac version of the popular first-person shooter Doom 3. Changes in version 1.3 of the game will include a preview of OpenAL support for 5.1 surround sound, better support for mods, support for the anti-cheat technology PunkBuster in multiplayer games and bug fixes. The patch will be available for download at MacGameFiles.com.