It is possible to change the how the play sound alarm sounds. Just record a new wav sound file and name it alarm1.wav or alarm2.wav and copy it to the program directory.
From the Windows Task Bar, select Start, Accessories, Entertainment, Sound Recorder.
From the Sound Recorder, click on the red button and record sound into the microphone. Select, File, Save As, and enter c:\program files\site monitor\alarm1.wav or alarm2.wav.
Exit Sound Recorder.
Now the new sound will play for the alarm.