Once the base layer has played once how can i get it to not replay again?

Hello,

On slide 1.13 of this storyline I have a base slide with multiple layers and multiple audio files.   Once a layer has been opened/reviewed it is programed to go back to the base layer.   When it returns to the base layer the base layer audio plays again and I do not want it to.  I would like the base layer audio file (#6) to only play once (stopping at 25 seconds).  Any ideas?

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