 As with all titles on the Xbox 360 , Halo 3 fully supports 5 @.@ 1 surround sound audio . In the game , there are over 50 @,@ 000 pieces of audio , with nearly 40 @,@ 000 of those being NPC dialogue . This is far more than in either of the preceding Halo titles ; Halo 2 had over 15 @,@ 000 pieces of dialogue . The AI controlling this dialogue is designed to ensure the exchanges flow naturally and convincingly . Separate recordings were made for nearby and distant gunfire to make for a more believable sound experience in the public beta , and the finished game uses Waves Audio plugins to modify dialog and other audio in @-@ game depending on conditions . Distant gunfire sounds , which may first seem like prerecorded ambient sound , may often be the result of an actual firefight happening elsewhere in the game . 
