Stop Overlapping Audio Tracks

I've built an interactive slide that has one base layer and 4 sub-layers.  The base and sub-layers each have their own audio track.  If the user decides to click on one of the puzzle pieces before the base layer's audio completes, the layer exposes and the audio begins to play.  But, it overlaps with the base layer's audio.  Any suggestions on of to avoid this, as I know I'll have some curious users that won't wait.  Thanks!

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