I want to change the default beep sound used to indicate missile tracking to sound more like a realistic aircraft RWR missile alert tone (can't find a good example...). I figure it should be easy enough for some of the coders here, but I haven't really been able to figure out enough Lua so far to do it myself. Anyone feel like taking a crack at it?

There's already deboop. I haven't tried it, though.
http://vo-wiki.com/wiki/Plug-ins#deboop

deboop alters hit sound, not missile warning. I looked at that one when trying to figure out how to write one for the missile warning, but couldn't make much of it.