Layer, back to Base, no audio repeat

I wonder if anyone has any advice.  I have a base layer with audio.  Users click an object on the base to go to Layer 1, and then click a button to return to the base layer to click another object to get to Layer 2.  This action repeats for several layers.  Problem is, every time I revisit the base layer, the audio repeats. How can I disable it after the initial play when the slide opens?

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