I hate to be like the umpteenth million person posting about this card this month, but I couldn't find anyone talking about this issue in particular at least in something that wasn't too old for justifiable necromancy. I've got the labway a151-a00 variety, and it works super(as in really shames creative cards) except I just have really low line-in volume in DOS games. Either win95 dos prompt or full ms-dos mode, either way the line-in is super quiet when I'm doing the midi module to line-in thing. Even if the module is hooked to another card. However, doing stuff that's win 95 native, like playing midis using the built in media player or playing windows games, the line-in level is appropriate compared with the volume of everything else. It's really strange, and I'm guessing it must just be something that happens to wig it out whenever the card goes into sb pro mode. Before I go assuming it's hardware and ordering another card, I'd be curious if anyone has any thoughts.

Edit: I did confirm it's something to do with sound blaster compatible mode, if I nuke the sound settings in dn3d setup, the line in sounds fine in the music test. If I turn sound back on, still fine. I play the bowling pins, all of a sudden the music coming thru the line in is a whisper.