Modded drivers , i'm a PAX fan myself . Used them on my old Xtreme Music soundcard awhile ago which gave me better sound quality and more options in the software.
X-Fi PCI Xpress xtreme audio card drivers
http://files.filefront.com/PAX+XFXA+Vista+V250rar/;12068208;/fileinfo.html
X-Fi Xtreme Audio
http://files.filefront.com/Pax+X+Fi+Xtreme+Audio+V20rar/;10983418;/fileinfo.html
X-Fi PCI Xpress xtreme audio card drivers
http://files.filefront.com/PAX+XFXA+Vista+V250rar/;12068208;/fileinfo.html
X-Fi Xtreme Audio
http://files.filefront.com/Pax+X+Fi+Xtreme+Audio+V20rar/;10983418;/fileinfo.html