Hey.
http://rog.asus.com/forum/showthread.php?47709-Sound-issue-(crackling)-with-Maximus-VII-HeroI had the same popping issue that henyK has, I managed to fix it with changing the input settings from HD to AC97 in the software.
However, I made the mistake of purchasing and installing Front Base.
Now I have the popping and also have a crackling that won't go away and gets worse with scrolling / moving my mouse. The only solution is uninstalling the whole Realtek driver suite and letting Windows install its default HD audio driver.
Now, from what I've read, the Maximus VI series also had this problem...
Are you serious, Asus?
I thought ROG was your premium line of products, you advertise the Maximus VII Hero with the best onboard audio ever, and then we have to suffer these kinds of stupid problems that you couldn't fix even with releasing a new series of motherboards?
I'm extremely disappointed, this is not a cheap standard motherboard and adding the price of the Front Base only makes matters worse...
Shame on you, ASUS! I'm demanding a fix for this problem as soon as possible. Stop releasing newer and newer drivers with the same problem, and fix it, for ****'s sake.
Cheers.