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Why are you so concerned that the 2068's (which DO measure better than most of the cheap alternatives) are going to have such an abysmal effect on sound quality when so many people are running through mixing desks or preamps or active monitors using TL072's, 4558's, 5532's everywhere? These are far, far worse opamps being used in far more expensive equipment. This is why I say I am surprised to see anything as good as a 2068 in the E-MU. I am even more surprised that you are so disgusted by their apparent poorness.
Yes, some small quality differences can sometimes come from using better opamps in a circuit. Would anyone actually notice unless they took it apart? Highly doubtful.
I swapped mine simply to see what would happen. To see if the approach that you're taking has merit to it. Frankly, after testing, it doesn't. Unless maybe you're got a million-dollar monitoring setup with better opamps used everywhere else - in which case I doubt you would go anywhere near a $199 soundcard anyway.
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