We're adding a semi-unobtrusive noise here in the Convention Center that would notify managers and security officials to check the pagers/blackberries etc... for an important alert.

The Gong noise would be perfect!

 

I'm not sure what you need , but I have a Ridetones system that I never installed that has the ability to download or install any sounds you want and tripped by any electrical signal tapped into your car,. Do a search. Pretty cool sytstem, I could sell you ,I don't think I'll ever get around to installing it.