Other options

Sound alarm at start-up if missed while program was inactive
Check this option if you want the alarm to sound if it was missed because the program was inactive. You'll for example want to turn this option off for 'unimportant' alarms like those which will tell you the time every hour.

Priority
Sets the priority of the alarm. This is used to filter alarms in the calendar as well as for certain options in the general settings.

Duration
Sets the duration of the alarm. This is used in the calendar in the main window.