Creative Audigy 4 Pro sort of explained
 

The Audigy 4 Pro card is based on the same chip that Creative is using for their current Audigy 2 ZS/NX series, as we suggested in the original article.

However, any of you who are waiting for a non Pro version of Audigy 4 will be disappointd as the company is not planning to release any cheaper version.

http://www.theinquirer.net/?article=19592