Set up an action group (myActionGroup) thatinclusdes two actions to run - a) Add ONE to a variable and B) play the audio if the variable = 5.The put the same action on each item to run the action group (myActionGroup) whenever the item is clicked. That means as each item is clicked, the variable values increments by one. When the last item is clicked, the variable value equals 5 and the audio is played.
