Windows XP
Open the [Start] menu, select [Control Panel] and
double-click on [Sound and Audio Devices Properties].
Click on the [Audio] tab and select [USB Speakers].
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Click on [Volume] and adjust the volume. If the [Mute]
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checkbox is checked, uncheck it.
Windows Vista
Open the [Start] menu, select [Control Panel] and
double-click on [Sound].
From [Playback], select [Speakers].
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Click on [Levels] and adjust the volume.
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