Specifications

CHAPTER 4
Software
System Software 41
Sound Control Panel 4
The Sound control panel on the Macintosh LC 520 computer is able to update its slider to
reflect changes in the sound level caused by the user pressing one of the sound
pushbuttons on the front of the case. The control panel also has a Mute checkbox to turn
off the sound. When the user adjusts the sound level, either with the control panel or
with the pushbuttons, the software also turns off the Mute checkbox. Figure 4-1 shows
the Sound control panel.
Figure 4-1 Sound control panel
The Sound control panel also allows the user to select the source of sound input, which
can be either the built-in microphone or a device plugged into the sound input jack.
When the user clicks the Options button, a dialog box appears, as shown in Figure 4-2.
The user can then select either the internal microphone, an external microphone, or the
line-level inputs.
Either the external microphone or line-level inputs can be plugged into the sound input
jack. When the user selects the corresponding input device in the Sound control panel,
the computer sets the gain appropriately.
Figure 4-2 Sound options