Audio Directors Of Halo 2 Talk ShopMusic4Games.Net has published a discussion between Bungies audio director Marty ODonnell and Aaron Marks, a popular freelance composer/sound designer and author of "The Complete Guide To Game Audio", about the use of audio in HALO and HALO 2. Here is a taste:
Marty:"Well be pushing the boundaries of each area even further in Halo 2. The AI conversation system will be many layers deeper and more complex. The dynamic music system will have more tracks, markers, and triggers to enable even more interactivity, without turning it into a music game, of course."