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When the TV Tuner is switched on, your PC's volume gets muted. Whereas if you turn off the TV Tuner & work on your PC, try using the MUTE, Volume Up (+) & Volume Down (-) buttons on your TV Tuners' remote. It really works!!! & controls your PC speakers' volume, even though your TV is turned off.
Haven't yet thought of this. Thats why this blog is there to make your mind innovative. Do try this at home & let me know if this has worked with you or not.