[Solved] Different volume on U46 channels

Hello, I'm using the U46 MK2 and MV DVS7 when I'm using the soundcard the left turntable is way more louder than the right one. The left ones level is fine, but on the right turntable I have to turn up the gain on the mixer to the max and turn up the gain in Mixvibes. I just doubt that's the way it's supposed to.
I've checked the the sound level from the turntables - they're basically equal.
So my question: Anyone having similar problems (or even better: anyone who solved this problem?)
*edit* Just checked: the volume on channels 5&6 is also lower...
Setup:
U46 MK2 (driver version: 1.0.41)
Numark TTX in line-mode
Vestax PMC-05 Pro III VCA
HP Compaq nx7400 Windows XP SP3
I've checked the the sound level from the turntables - they're basically equal.
So my question: Anyone having similar problems (or even better: anyone who solved this problem?)
*edit* Just checked: the volume on channels 5&6 is also lower...
Setup:
U46 MK2 (driver version: 1.0.41)
Numark TTX in line-mode
Vestax PMC-05 Pro III VCA
HP Compaq nx7400 Windows XP SP3