Selecting alarm tones
1.From Day View in Calendar, open the menus 
.
2.Select Options, and then select Sound Preferences.
3.Select the Volume box.
4.Select each pick list and select an Alert Volume and Vibrate setting.
5.Select the Tones box.
6.Select from any of the following:
•Alarm Sound: The tone played the first time your alarm goes off
•Reminder Sound: The tone played if an alarm is not acknowledged and the alarm repeats itself
•Play Sound: The number of times an alert tone will play during the alarm sequence
•Repeat Alarm: The number of times the alarm repeats itself if the alarm is not acknowledged
•Every: The interval between alarm repeats if the alarm is not acknowledged
•Alarm Preset: The default for the number of minutes, hours, or days before the event for which the alarm goes off
7.Select Done.
You can also record, preview, delete, and send sounds to use as alarm tones. Go to Applications and select Sounds. Select Tones, and then select Manage. To record a sound, select New. To play a sound, select it and press Center. To delete a sound, select it and press Backspace, and to send a sound, select it, and then select Send.