Change which device is used as your input device (a microphone)
An introduction to the Sound pane, change the sound effects your computer uses, as well as your input and output devices
How to Open the System Preferences in Mac OS X Leopard
Choose which device is used as your output device (your speakers or headphones)
Change the default alert sound your computer plays
Disable computer sound effects (ex: when you empty the trash or change the volume) and Front Row effects
