Q&A: What could be causing my output sound to show up on my input sound?

Question by Frank: What could be causing my output sound to show up on my input sound?
Any sound that my computer processes to send out, either to speakers, headphones, or whatever, and regardless whether anything is actually plugged in, I will get the sound in my input (microphone slot). I realized it first when people said they could hear my music when I talked on Ventrilo while I had music playing. Now I'm seeing it affecting me trying to record through my microphone jack. I have my

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