Apple PC Compatibility Card - Manual (Page 178)

178 Chapter 7
The Mac OS treats all PC sound as if it were coming from the internal
CD-ROM drive. You can still use the internal CD-ROM drive to play CDs and
CD-ROM discs in the Mac OS.
Note: Microphone and line-in are not supported by the PC Compatibility Card.
Turning PC sound on and off
To hear PC sound, you need to turn on sound for the PC by following
these steps.
Note: Before you begin, make sure that sound is turned on (not muted) in the
Mac OS.
1 Open the PC Setup control panel.
2 Choose an option from the Sound pop-up menu.
You can choose the following options:
m To hear PC sounds in both environments, choose Enabled.
m To hear PC sounds only in the PC environment, choose Auto Enable.
m To shut off PC sounds, choose Disabled.
3 Close the PC Setup control panel.
Open pop-up menu to see the different
PC sound options.