What Dockwagon said is correct. It's designed for doctors. However, as it still covers all original chat alert default configuration/sounds, I assume it is still useful for other professions to a certain degree.
For example, you can instantly learn that you are debuffed/drained/snared/rooted in BS/Alb/Alapp, DB debuff is coming, etc. Although you won't get notice for the termination of your professional specific nano, you can still get more alert than usual.