Depending on the program you are actually using... If you use the standard GNOME Mixer, it has a preset of labels (in some cases the igain and ogain represent rear and front speackers) check the nVIDIA package (I don't have an NForce card, so I cannot say for sure, though I've worked with one) and there should be a program to configure the standard mixer device for the NForce (don't mind me much, but I think it is called nfmixer)
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