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If the mic input was not functioning properly as a line in, would I still get graphs like these?
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Yeah, you can check it out by first seeing what the response of the mic input to the card is when you do the soundcard calibration routine. This test will show the response of the line-out connected to the mic-in and you'll know if it's worth using at all.
Then you can check with a DC meter to see if there is any DC present on the mic jack itself.
If it's a go after that you could do a response and see what the noise level looked like, and if OK, it will certainly produce regular graphs just like a line-in.
But why bother - just get a cheap soundcard.... it's less than the price of a pizza.
brucek