How Toshiba adjusts the left and right channel volume in the Vista operating system.
1. Right-click the small speaker in the tray area in the lower right corner of the screen, and this will appear. In the right-click menu, click "Playback Device".
2. In the window that appears, double-click "Speaker".
3. A speaker window will appear, click the "Level" tab, and click "Balance" on the right side of the first row of speakers (the name of the sound card may be displayed here on your computer).
4. Drag the balance here to 0-100 to turn off, increase or decrease the volume of the front left and front right.
In this way, you can watch movies or listen to songs without hearing two-channel sound at the same time.