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RE: Switch surround sound channels?
I know in a standard 3.5mm audio cable there are two channels and a common return. You could think of them as +R, +L, and -both. I don't know if mixing return paths between the 3 outputs on the motherboard is acceptable or not, so it's quite possible that you would need to factor that into your design.
My first instinct would be to place the device between the receiver and the speakers, instead of the PC and the receiver, and switch the "grounds" at the same time as switching the channels.
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