I am working on a project which required an audio on/off button so the user could toggle between full audio mode or just text.
Object doesn’t support this property or method[/CODE], which seems to relate to this line of code:-
Given that the original post is from 2013, I hope he figured something out.
However, for new people finding the post, in Lectora V16 there is an action for Mute Media and one for Unmute Media. So he could just create 2 small buttons, one to mute, one to unmute and set his audio as the target. Then you just have a simple button with 1 action that works on a page by page basis.
You could even set the global level early in the course to make all pages muted or unmuted (as @blankgm had explained in the previous post) and then use this functionality on a page level to override that setting.