I have a Realtek HD Audio rear output sound card. I've tried going into the sound options > playback and muting microphone, but it doesn't help at all.
I've also tried turning Acoustic Echo Cancellation on, but it doesn't help either.
Try double clicking on the windows sound in the taskbar. Click Options -> Properties and select the Recording option. Make sure all volume controls are checked to show and click okay. Try muting all but the microphone line and see if that helps.
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