How do I limit audio to play just once on first visits to slide?

I am hopping between slides, but Resume saved state does not answer my problem.  If you use resume saved state , and the user leaves that slide before the audio is finished, if he returns again to that slide the audio will play from where it left off.  I don't want this to occur.  Also it does not solve my main problem which is the repeated play of an audio file I only want to play once.

Let me try to explain better.  I have a home page (main slide) with four pictures of different melons.  When you click on a melon picture it takes you to the first slide of four slides with information about that particular melon you have chosen.  This first slide is the Menu slide.  On that slide the user can click on four buttons labeled  "Description", "Look, "Taste", and Availability. Now on this first Menu slide I have a little audio instruction that tells the user to click on one of the buttons to learn more about the Discretion, Look, Taste or Availability of this type of melon.

Here's the thing, now that the user has heard this instruction, I don't want him to hear it again when he goes back to the home page and chooses another melon.  As it is now, when the user goes back to the home page and chooses another melon, he will go to that particular melons first Menu slide which will again play that audio instruction which I have on each of the Menu slides.

I would like a variable that allows that instruction audio to only play once, if it has been played.  Your variables instructions seemed like just the thing I needed but it did not work, I was thinking I did not set the variables correctly.  I am including a zipped up sample of my project if you want to see whats going on.