Line In + Optical Out = not working

[Andeh]

ok well basically, I have my amp connected to my computer via optical out, and I have my PS2/Wii etc, connected via Line In. Problem is, im getting no sound through the optical out. It seems to come through the Line out instead. Anyone know how I can force the Line In to output through the optical, instead of the Line Out port?

Cheers.

 

[Andeh]

yeah, but I the point is, I need to PS2 plugged into the Line in on my computer, for recording purposes.