Pausing text-to-speech when new window/slide is open

Hi Everyone,

Is there a way to stop the text-to-speech narration from continuing when a new window/slide is open?  I currently have a scene with one layer, where the user is asked to click on a variable to learn more.  This opens up a new window, however when i close the window the audio is still going on the base layer.  Is there a way to pause it until enabled by the user?  I tried creating a condition, but I can't seem to find the 'play' option under the list of variables for the user to click. 

Thanks!