Macbook air rev 3.2 Usb Audio interface Interferences

Hello,
I'm having an issue with my macbook air rev 3.2 while using an external Audio Usb powered card (Native instruments Audio8 DJ interface).
I get cpu related interferences through the audio device, touching the track pad, the input keyboard or performing any use of the computer increases it.
This happens when the power adapter is plugged in but not when on battery power.
I have used the audio device on different computer such as my macpro rev 4.1 macbook pro 13' 2009 and macbook pro 15' 2009 without any issue.
Is this present on all macbook air from this series? is it a shielding problem? is there any solution except using it on battery power?
Thanks
Best
K

My Air does similar. I'm certain there is some kind of earth loop through the charger. Not the first Apple laptop that has done it to me. (I'm in UK where the power wiring rules are a bit bizarre) With my Air on charger, I get hum in the headphones unless I touch the body of the air. On my old Powerbook G4 it was the other way round.
Battery life on the Air is so good, the solution is simple.

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