OSX programmatically invoke sound level graphic

Question

I have an app which can change the volume under OSX. What it lacks is the visual feedback provided when one presses the sound up/down keys. Does anyone know how to programma

Answer 1

I would implement this by simulating the physical press of the up/down volume keys, and letting the OS deal with the details. Perhaps the user has disabled the visual feedback, perhaps it changes, etc. - this is the safest way of pulling it off.

Have a look at this: Simulating key press events in Mac OS X