USB MIC Problem with Alienware M17x R3

I have an Alienware M17X R3 (IDT HD AUDIO)

I just bought Asus USB headset cinevibe, the problem is the microphone when I insert the USB the driver installed correctly but when I talk the volume of my voice is very low, in the settings of windows 7 the microphone level is at 100 % and the AGC is active, what you hear is my voice very low and an annoying background noise as a subwoofer, with the AGC on, the green bars that indicate the use of the microphone are constantly in half (see the picture below), if I turn off the AGC instead the green bar become 0/1, but volume is lowered further and remains always sound like a subwoofer, I tried to see the settings of the sound card IDT but the panel microphone has only a single bar to increase boost, the bar is set to maximum, even if the value is 0 db and I can not decrease it (see the picture below), I tried to uninstall and reinstall the audio drivers, I have tried to disable all audio devices and all microphone except headphones ASUS does not seem to work anything.

the microphone volume becomes normal only when I speak very loudly with the microphone attached to the mouth

I tried the headphones on another PC also with IDT sound card, the microphone on the pc works perfectly, then exclude that is a defect of the headphones, I noticed that the only difference between the two computers, is the version of the IDT control panel, my interface is blue and the other PC is black I do not know which one is the most recent, I tried to update the driver but the most recent (05/25/2011), in the DELL site, however, on the site of IDT, I can not find any drivers to download.

Enrico

http://i46.tinypic.com/zixba8.jpg