How to hide and disable the Play/Pause button in the SL360 responsive player ?

I'm using the new Modern player with default settings that include the pause/play button and not the seekbar, since most of my slides include an audio file, layers and/or animations. I have a collection of slides that do not include audio or animations, and for these I want the pause/play button hidden. I'm able to accomplish this for most of these slides by using the custom settings. While there isn't the option to hide the pause/play button, just selecting custom settings seems to remove it. There are however a few slides that I'm unable to hide the pause/play button even when I select custom settings. Is there something I'm missing?

Thanks!

Kerrin