The Sound Effects extension adds sound effects options to the Sound control
panel. Follow these steps to use Sound Effects:
1) Locate the Sound Effects file and drag it to the icon of the System Folder
of your startup disk. A message asks you to confirm that you want this file
in the Extensions folder.
2) Choose Restart from the Special menu. The new options aren't available until
the computer restarts.
3) Open the Sound control panel and choose Effects from the pop-up menu. The
Effects section of the control panel appears, showing another pop-up menu.
4) Choose an effect from the pop-up menu. When you choose an item, the current
alert sound plays with that effect. The effect you choose remains active for
all sounds the computer plays until you restart the computer. At restart,
the effect choice reverts to None. If you want to keep using a sound effect,
you must choose it again.
Important Note: When a sound effect is active, you can't change the sample
rate in the Sound Out section of the control panel.