i discovered i had to activate the notification message to hear the sound...
it is a "pin in the ass" because, before i could save and go to other application in my workflow and use my ear to know all is ok.
Now i have to wait the end of the save operation and clic another button !
You should add another option in the message window :
Ear a default window sound system
and another better option :
desable the notification when all item of total are saved, just play the sound and release the instance and the focus to system