as I pb-ed...I don't see how you run a microphone thru a midi port. Midi works with din-plugs.
Din plug:

If your soundcard has a mic-in it probably eats minijacks.
Mini-Jack:

does your microphone have a plug as in the last pic or another?
[edit] if your microphone has a plug like the above page, sticking it in the midi interface won't help, you'll need to convert to a plug that your mic in can eat [/edit]
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