Steremix Microphone loud hiss / ringing

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So, I'm using a laptop I was given to run teamspeak and play music into it. I muted the audio of teamspeak and set the microphone to continuous talk with StereMix as the microphone. So the music plays great, but if the music is turned off (or it is sometimes heard behind the music) it'll make a... Steremix Microphone loud hiss / ringing