Audio Player: Choose On/Off by Default

If a book has audio accompanying it, it would be great if we could choose to have the audio player on by default rather than relying on the user to turn it on or off. Audio only books already have the audio player on by default so the functionality is built inside SAB but it should be added to all books.

Along with this, I would like to remove the user’s ability to turn the audio player on/off. For example, if we have an app where audio is the focus (either audio only book or text is secondary/reference material), I would like to prevent the user from inadvertently turning the audio off and not knowing how to turn it back on, i.e. removing the speaker icon from the menu bar.