Stop audio and some images when revisiting a slide


I have a slide that serves as a menu/TOC. It has audio to introduce the course and how to navigate it, and includes close captions. The CC are simply text boxes that appear and disappear in time to the audio. Learners can click buttons to go to the topic they wish to learn about, and then return to the menu. When they return, the button changes color to show that they have visited that topic. However, I want the audio and CC to NOT play when returning to the menu. How can I make this happen? Many thanks!

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