Resuming play of audio on base layer


I have added audio to my base layer and a separate audio file on a separate layer.   The separate layer is selected by clicking on a hot spot.  I have a trigger pause the media on the base layer.     After the separate layer is viewed and audio played, the learner clicks an "X" to return to the base layer.   I want the audio to resume playing the audio on the base layer.   Would you tell me how to set that up please?

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