Hmmm... This is interesting. I checked the AC97 spec that linked to on that page. It shows the sensitivity of the Line-in and Mic-in to be the same if the +20db boost is off. I'll have to try that by plugging my mixer into the mic-in and turning off the +20db. If so then it should be the same volume as the line-in. Never would have thought that. But the manuals for sound cards I've seen don't show input sensitivity.
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