Playing 2 voice overs on 1 slide


I have a course that has two tracks. The learner picks a track at the beginning and the pictures that appear are relevant to that track.  The triggers are based on true/false variables.  I would like to have 2 voiceovers on a slide.  Voice over 1 is on the base.  When they click on a layer, I want the voice over 2 from the other track to play.  Pause audio 1 when the user clicks andI play audio 2 if Track 1 is false.. It doen't seen to work.  The right picture is showing but both audios pay.  Any ideas?

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