Apple AppleVision monitors (OS 7.1) - Manual (Page 55)

Removing an alert sound
To delete an alert sound installed on your computer, follow these steps:
1 Open the Monitors & Sound control panel, then click the Alerts button.
2 Select the sound you want to delete from the Alert Sound list.
The computer plays the sound when you select it. If you click the sound more
than once, it will play once for each click.
3 Click the Delete button.
Note: The Simple Beep sound is permanent and can’t be deleted.
3 Click OK to confirm that you want to permanently delete the selected sound.
The sound is deleted. It cannot be recovered after you delete it.
Tips
m If your microphone is in use by another application, or if Speech
Recognition is turned on, you won’t be able to record a new alert sound.
m The maximum Alert Volume is limited by the other volume settings for
your computer and sound output devices. The alert sound can’t be made
louder than the highest volume set on your system.
55 Alert Settings