Restricting Movement Through Layers until Audio has played on all layers

I am running into this same issue with a slide that has 2 items to hover over. Each layer associated with the hovers has audio, but I cannot get it to prevent the user from switching to the other layer before the audio is finished. I have tried adding a hot spot to each layer, and then a regular rectangle, but neither works - the user is still able to hover over the other area even with an active hot spot or transparent rectangle covering it (I made the rectangle transparent so the slide would still look normal, but I don't see why that would make it function differently and NOT block the items behind it). I have selected the option to "Prevent the user from clicking on other layers" on both but still it does nothing.

What am I missing?? I think I'm going to have to choose "Hide Objects on Base Layer" and then manually re-create the base layer within each sublayer, except for the other hover area. But this seems crazy and super inefficient....