Hi, Paula!
Thanks for reaching out about this. I'm happy to help!
I understand that the audio on your slide does not pause as you'd hoped. First, I'd like to confirm that you have the Play / Pause option, and Volume option checked off in Player Controls. You can check by selecting Home on the top ribbon > Player.
Next, I'm curious to learn if this issue happens when you preview the course or when published. If you're willing to share your file, I'd be happy to take a closer look to investigate what's going on. You can upload it here or share it privately in a support case. We'll be sure to delete it from our systems once troubleshooting is complete!