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3Click the icon that represents the source of sound output.
About the sample rate: Most of the time you will not need to change the
sample rate. Use the Rate pop-up menu to change the sample rate only if the
sound you wish to play was recorded at a sample rate different from the
current setting. For instance, if you play a QuickTime movie containing sound
recorded at 44.1 kHz, set the sample rate in the Rate pop-up menu to 44.1 to
hear the full quality of the sound. Increasing the sample rate slows
performance.
m Do not set the sample rate higher than the sample rate of the sound you are
playing, since this slows your computer’s performance without improving
sound quality.
m Do not change the sample rate if playthrough is in effect.
m Do not change the sample rate for sound coming from a device connected
to the sound input port.
The other options cannot be changed. If you use a program that provides
sound recording in mono format, you can use its mono setting.
4Close the Sound control panel.
Recording an alert sound
Although your Macintosh can produce stereo sound, the computer records
alert sounds in the same way as other Macintosh models: in 8-bit mono
sound, at a sample rate of 22.254 kHz. This makes the alert sounds you
record compatible with all Macintosh computers. See the Macintosh Reference
for instructions on recording an alert sound.
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Chapter 7