How do you pause the main slide audio if you have pop-ups on the slide that also contain audio?

Hello, 

I have a slide with a few hypertext links for some technical terms that need to be defined for the learner. I have designed it so "pop-up" text boxes with the defnitions appear when they click the links for the terms. However, I want audio narration on the main slide as well as for the pop-up text (I have embedded audio into the text boxes of each pop-up). What is the best way to pause the main slide audio when you click on the links with these pop-ups so that you don't have dual audio tracks running at once? Obviously, I want the pop-up audio to play when they click on the link for that pop-up. Then, when they click a Close button that I have also set up for each pop-up, the pop-up should close and the main slide audio should resume from where it left off. 

So right now, I have advanced actions for each of the popup links that includes a Show command for the popup as well as the close button for that popup. And then on the flipside I have an advanced action for each pop-up that also has a Hide command for that pop-up and the associated close button that is activated by the close button for the pop-up. 

How can I integrate an audio pause/play situation like I described above into this design so that:

1. The main slide audio is paused when they click on a pop-up link; and 

2. The main slide audio resumes when they click on the Close button for each of the pop-ups. 

Thanks in advance!