i have my microphone plugged into the asus xonar via the front panel mic slot, and when monitoring the microphone it sounds normal. but as soon as i enable it in skype it immediately applies an echo to the mic, When i say echo i am not referring to feedback in the mic i mean that the mic sounds like it has one of the soundcards effects applied to it and it sounds like im talking in a cave. Ive tried quite a few things to fix it but cant seem to figure out what the problem is.
More about :asus xonar producing microphone echo skype
saw many people having that problem, but it was solved by plugging the your Asus Xonar card as far as possible from the gpu(if you are using one) or away from cpu installation. Hope that solves your problem. Good luck