Creative today announced its agreement with id Software relating to Creative's patented shadowing technique & id's cutting-edge 3D graphics DOOM 3 engine, allowing Creative to develop EAX ADVANCED HD 3D audio options for future licensees.
Positional audio in Doom 3 is said to take a major role in gameplay terms (making for a creepier environment), even more so than in previous games using EAX technology. You might remember Robert Duffy's .plan update yesterday detailing how much work they've put on audio technology.