I just got my Innodock with audio connector. When I connect USB cord to the USB port and Audio cord to Line In of the computer I get some static noise in the speakers. Note that this only happens when both cables are connected. If I unplug one of them the noise disappears. Is there a way to avoid this problem?

I know one way is to not plug in the audio cord to computer's Line In and instead just connect it directly to speakers/headphones, but I'd like to have the audio go through the computer so I can switch from listening to the audio on the computer to the audio on the phone without messing with the wires.