from the 396T manual,
Setting Emergency Alert (Motorola and EDACS Systems Only) J
Program System
Select the system
Edit Sys Option
Emergency Alert
Off - the scanner does not alert you to emergency transmissions.
Alert 1 - 9 the scanner sounds an alert beep to notify you of the emergency transmission. You can choose any of 9 different beep types
and it is mentioned in the sds100 manual
Emergency Alert Sets the alert sound and alert indicator when the scanner receives an emergency status from the system.