Using Gearbox, the 1/4 Inch output is set to "Match Studio/Direct", but I'm not sure if it is what you are talking about.
Also, I may have been using the wrong words as english is not my first language. (even though that's not the most important, it might be the root of the problem?)
If I plug the X3 on, the computer TRIES to use the X3's soundcard to play, for instance, a Youtube noise. I tried to launch a movie, it worked for 1 second and then shutted up.
Before I switched computers, it was recognizing X3 as connected, but was letting my computer's soundcard as the primary one. I used the X3 along the ASIO drivers - for instance, I could load a music through my computer speakers and play using headphones plugged in the X3 - using the following chain
Attached file shows what happens with the new computer. My Windows is in French, but I just wanted to show how the X3 soundcard was plugged as the primary, letting the computer's (VIA) one to a "slave/passive" mode.
Well, I might be a bit confused because of the XP/W7 change...