[Kayon]

I got my first ever dedicated sound card, didn't want to go overboard so I bought an Asus Xonar DGX.  All the settings in the control panel of the sound card are completely foreign to me, so I needed to input on what the best settings would be for best quality.  I mainly play games, FPS, as well as listen to some music.  Some of my basic questions are:
 
Audio Channel? 2, 4, 6, or 8?
Analog Out? Just choose headphones? or 5.1 speakers.  I also have a few other checkboxes, PCM? Dolby Headphone? 7.1 Virtual Speaker Shifter?  Should I enable any of these?
DSP Mode, GX or HiFi?
 
Any help would be greatly appreciated!