Basically what I want to do is hook up my headset microphone to the microphone input, and my MP3 player to the line in input, then be able to have both audio inputs playing at the same time. I want to do this so I can play music and talk at the same time on Teamspeak. Is there anyway to do this on windows 7 or do you need some sort of drivers/software?
Try it, should work. But why don't you just play your music right off the PC? I'm guessing you used the PC to get music ON your mp3 player to begin with. So what you are doing is moving music from the PC to the player, and then connecting the player to the PC to play it.