Thanks Mertsch. Creative has released a new Sound Blaster X-Fi Audigy beta driver
>> Sound Blaster X-Fi Audigy BETA Driver 20070827
This latest driver includes some performance enhancements made in particular for Unreal Tournament 3 and other UnrealEngine3 based titles.
Please be sure to install the latest driver from http://www.creative.com/language.asp'sDestUrl=/support/downloads first before installing the beta driver. You do not need to uninstall the previous drivers before installing the beta driver upgrade.
>> Sound Blaster X-Fi Audigy BETA Driver 20070827