MIC in

I have a Gamesurround Muse™ 5.1 DVD soundcard. I can not get the line in to work with this card. I can use the mic in and I seem to get a good calibration. The output and input controls are not accessable in REW but I can adjust with the soundcard mixer. I have it set to 2 ch and the effects off. I use a stereo cable with a mini plug on each end. One end is connected to front out the other to mic in. I can get no response from line in. Any ideas? Should I get a new card or is mic in ok since I am getting a good calibration?

[JohnM]

Best post a screenshot of the cal response and ideally also the impulse response graph from the cal measurement. Difficult to see why the line in shouldn't work though, probably worth further attempts to get that running.