Hi there, Many people have some Asus sound card and was "dreaming" about Asus Essence ST (stx) and was wondering about sound quality improvement. So do i. So i have Asus Xonar D2x (7.1 sound card for my old`ish logitech z5500) And now bought another Asus Xonar Essence ST for normal stereo AMP and floorstanders. ASUS Rampage III Extreme motherboard. Problem: both cards are using ASUS Xonar audio Centre, and if i install D2x drivers, i will "see" only d2x, if install Essence ST, will see only ST. So i have great possibility to do A/B testing between sound cards, but software do not aloud me to do so. Re-install every time "buggy" asus drivers is real pain at the back and takes too long for A/B testing. I know its totally different sound cards designed to do different job, but STILL would like to try some testing. First impression comparing headphones built-in amp is tremendous. Essence ST simply easy can handle sennheiser HD650 and volume is more than enough. Totally happy about headphones output. And Stereo must sound a bit better, but we don`t know, because need to set all volume at same level and all default settings and so on. So any advice how can i "see" TWO ASUS sound cards in control panel/ sound devices and be able to switch to default? P.S. emailed Asus tech support too. But we all know how "good" A.S.U.S support is.