I'm not certain but I believe to upmix to 4 channels the Audigy needs to do a A/D-D/A round trip. If you just set the mixer to route line-in to the outputs it wouldn'ts suprise me if it didn't/couldn't do the upmix. You're probably going to need to use an application that can capture the line-in channel and play it back live. This would allow you to do the upmix via your settings in the EAX console.



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