1 Open the Control Panel (icons view), and click/tap on the Sound icon. 2 Click/tap on the Playback tab, double click/tap on the output device you want to adjust. (see screenshot below) 3 Click/tap on the Levels tab, and click/tap on the Balance button. (see screenshot below) 4 Adjust the L eft and R ight audio balance level until it sounds ... More @Wikipedia
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