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I've got an Asus K8V motherboard. The internal sound card has 3 ports. Normally I use it with a 4 speaker system. When you have it configured this way, port 1 is "line in", port 2 is "front" and port 3 is "rear". When you have it set for headphones, port 3 becomes "microphone".
This is very annoying because it seems I have to physically mess with the ports to use TeamSpeak and my boom microphone. Can I plug my mic into "line-in"? I've tried this and haven't had much luck.
Microphones produce too weak a signal to be connected to a "line in" port. If you want to connect a microphone to a "line in" port, you'd need to use a microphone preamp like this one. Check out this page for more info.
You'd think you would be able to select mic vs. line in via drivers, though. Have you checked to see if there are newer (or alternate) drivers available?
i don't know that specific mobo per se, and I don't know if it's Onboard sound or a Card, but here's some info;
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The Output Mode determines what type of signal is sent to the line out jack. When Autosense is selected, the Line-out jack will sense whether the jack plugged in is S/P DIF or analog stereo. When Analog is selected the output will be forced into analog output. When Digital is selected the output will be forced into digital output.
S/PDIF Ouput allows the output to be sent to both digital and analog devices, or to digital devices only. If set to digital only then the output will only be sent out in digital format, no analog signals will be sent, allowing for quieter playback and recording.
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these settings are found in Device Mangler >> Sound, Video and Game Controllers >> Sound Card >> properties >> settings tab
also review your Control Panel >> Multimedia (in 98, but XP who knows?) >> Audio Tab >> Advanced Properties >> Speaker Setup and use the Drop down box to choose the Setup
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If you see this 3D Audio Tab under your Sound Card in DM -
The 3D Audio Tab simply allows the user to choose between Headphones and Stereo Speakers for their listening device. It is recommended to be sure that is set to the proper setting as the SBAPCI64V uses slightly different algorithms for reproducing 3D sound on standard speakers than headphones.