Setting up AD700s and a ASUS Xonar DX for solely/primarily gaming

I just got my pair of AD700s coming from my Sennheiser PC 350s (which after a few years got this weird static aspect to them) I was just wondering how to properly set for optimal sound gaming since I'm a total sound noob but I've always been a headset user and would really like to get my sound "proper" so I don't have to tweak with it further in the future.

All I got so far is 

Audio Channels 8

Sample rate 96 Khz

Analog out Headphone

And Dolby Headphone enabled (with DH-1 selected to minimize the echo the others seem to give)

Any advice about how to tweak the above settings or what would be "proper" for gaming would be DEFINITELY appreciated by either posting here on getting in contact w/ me over on Steam @ RichRuzz to help me set this up. I'd gladly be willing to buy someone a 15-20ish dollar title they want if they can help me through getting my sound coming out "great" since I've always just winged it with sub-optimal sound.

Yeah, just downloaded the latest version of those and removed the ASUS drivers. Now I just need a bit of help tweaking like what I should, and shouldn't have enabled/set.

Bump, still looking for overall help since I'm home from work and don't want to spend all day failing again. xD

Also, I am getting audio distortion in the form of a "crackle" or pop on certain noises and it's not significant but it is there even if very low. It happened with my old sound card, my current, and my Senheisser 350s and my current AD700s so I'm not really sure what it could be from. -_-

Any other setting suggestions? And I wish I knew what was up with that minor distortion also. :/

Like someone said 2Channel Audio with nothing else and 44.1 Khz with Windows in headphone mode will full range checked.