I am using headphones for the output of my UX2. My headphones and 3.5mm stereo jack adaptor are working fine as i have tested them with the phones output of my amp. I am able to get the mp3 output from itunes as well as my bass playing from the headphones. The problem comes when i try to increase the volume of the phones via the knob, only the right side experiences and and the left side remains at the original.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            I am using windows vista. I have tried going to Control Panel> Hardware & Sound > Manage Audio Devices > select UX2 > Properties. Under "Levels" the balance is equal. But when i click on "Test", the sound check comes with the uneven sound balance. Both the left and right are at an approximately equal volume with the phones knob set to 0 boost. But as i turn the knob, the right side gets increasing louder whereas the left side remains at the original volume. I really wish that this isnt a hardware issue as it very difficult for me to send it for servicing as the nearest centre is in the next town. I hope somebody will be able to help me out. Thanks in advance.