OK found it. Fixed it, and you guys were spot on ! The sound improvement is truly enough to make your eyes water. I'm glad I found this place.

I was hotrodding my X-Fi and got a blob of solder on the 3rd. resistor (counting top down, to the left of the main OPAMP) Its value, I assume, is the same as the other three, 33ohms. The problem is that I totally wacked the solder pads and can't find where to connect a replacement resistor...