4-8
IBM Personal Computer User Guide
• You can also plug headphones into the line-out jack on the back of the system
unit. This is the same jack to which the external speakers connect. You must
disconnect your speakers to use this jack with your headphones.
If you plug your headphones into the line-out jack on the back of the system
unit, the headphones will pick up all sounds generated from your computer and
any external devices connected to the computer, such as a MIDI (musical)
keyboard. The headphones will also pick up sound coming from a CD in the
CD-ROM drive.
Note:
When your headphones are plugged into the line-out
jack on the back of the system unit, you
must
control
the headphone volume through the volume-control
program on your computer. You
cannot
control the
headphone volume from the volume control on the
CD-ROM drive.
When using the line-out jack, some sounds, such as
the error-code beeps generated by the power-on
self-test (POST), might not be audible through the
headphones or external speakers.
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