Xoom tablets have more than one tone for notifications, ringtone, and so on. Here is how to set a unique tone for notifications.
Change the notification ringtone on Xoom - Tutorial
1. From the Home Screen, touch Apps > Settings > Sound > Notification ringtone.
2. You will see a list of default sounds for notifying you of events.
3. Pick your desired ringtone by tapping on it and then tap OK.