Hi, I have a new Behringer Xenyx X1222USB mixer hooked up to my computer with Windows 7 and Audacity hooked up directly with the USB cable. I have been doing some tests.
In my earphones my voice and every adjustment can be heard nice and clear. When I make a recording, I change the highs and lows and can hear them live in my headphones. I've messed with some of the effects as well and they sound great live while I'm recording in the headset.
The XENYX X1222USB is a step up from the XENYX X1204USB. With six mono mic inputs. These two additional channels can also be used for stereo line-level devices, such as keyboards or sound modules.