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Question: Turn off Microphone/sound input

I have an ASUS Asus K7010 laptop that I believe has an Xonar D1 Sound Card.
I want to record streaming music as my laptop is playing.

Of course, the software picks up any incoming noise so irt needs to have the mike turned off.
I have Windows7. I canoot find the mike oon/off either in the icon, or in the ControL Panel Sound Device section.
Does anybody know how to turn input sound off? Thanks, JDK