When I plug in headphones to the case front panel, the left channel comes out of the right ear (and vice versa), whereas when I unplug them, the left channel comes out of the left desktop speaker (i.e. the right way round). Desktop speakers plug into rear panel. It's not possible to plug the front panel HD Audio in the wrong way round due to pin configuration.

The headphones have a definite left and right shapewise, so simply wearing them the other way doesn't work. I could swap the desktop speakers round, but I can't see how you reverse the channels on the audio device.

Any thoughts?