all i know is that thx is definitely just a marketing thing that creative loves to do.
and that i will not be upgrading from audigy (1) to the new audigy 2; i don't really plan on upgrading sound card before my videocard or something more crucial to me. besides my speakers, z560, are working fine with the audigy so far and i don't want to go to the trouble of opening my case, removing one card and putting in another that's more expensive i probably wouldn't notice too much of a difference; not to mention the annoying drivers.
then again, i'm just another cheap, poor college student...