Playing Audio on base screen & layers

I am hoping someone can help...

I have a slide with 3 layers, the base layer has an image with 3 buttons each linked to a layer.  On the base side there is the audio containing the instructions for the learner.

On each layer there is a separate audio clip giving more information about the area of screen the user clicked the button for.

If I click one of the buttons and move to the layer before the base layer audio is finished, I get to listen to both the remainder of the base layer as well as the layer audio at the same time.  

However when I click on the refresh icon at the end of the seek bar nothing happens, the audio/animation do not replay.

Based on this I have 2 questions

  1. How can I ensure that the audio is only played when the screen/layer is being viewed?
  2. Why does the replay icon not work on these slides or what can I do so that it does work?

Once again Many Thank in advance.

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