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If you have a mic plugged into the mixer, you need to pan that channel fully left or right. Then choose which ever side you panned as the input on your soundblaster. Be sure your track is mono.
Thanks Pinky for caring but what do you mean with input is correct?
The audigy has a stereo line-in (if he was using a Mic-In, that would be mono). I'm not sure why he would need to pan.
The mic is a mono source. Why record the same signal on two channels?