Connecting A Microphone; Adjusting Volume - Compaq Evo N400c Hardware Manual

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WARNING: To reduce the risk of personal injury, turn down the
volume control before putting on headphones.
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CAUTION: To prevent possible damage to an external device, do
not plug a single-sound channel (monaural) connector into the
stereo speaker/headphone jack.

Connecting a Microphone

When connecting a device to the microphone jack:
Use a single sound channel (monaural) microphone with a
3.5-mm plug.
A powered, single sound channel, electret condenser
microphone is recommended.
Only the left channel will be recorded if you use a stereo
microphone.
The recommended sensitivity will not be achieved if you use
a dynamic microphone.
When an external microphone is connected to the computer, the
computer microphone is disabled.

Adjusting Volume

To increase, decrease, or mute the system volume, use the
following methods:
Computer volume buttons
Hardware Guide
To decrease volume, press the left button.
To increase volume, press the right button.
To mute or restore volume, press both buttons
simultaneously.
Audio and Video
6–3