HP OmniBook 5500 Notebook PC - Manual (Page 13)

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To temporarily silence the speaker output without changing the volume setting, click
Mute in the Volume window. You can use the other controls in Volume-Mixer Control
to control the volumes of individual sound sources—see
“To record sound” and “To
play sound” .
Important
When you adjust the volume using the Fn+F8 or Fn+F9 key combinations, you are
adjusting the current volume and you are also setting the maximum volume that can
be played in Windows. If the volume in Windows is too low, you may want to adjust
it with the FN keys.
To connect a microphone, speakers, or headphones
Your OmniBook has a built-in microphone above the keyboard and two stereo
speakers.
You can also plug in an external microphone, external speakers or headphones, and
a stereo input source—such as a CD player.
• Plug the microphone into the microphone jack—the built-in microphone turns off.