Is there a way to dynamically set the "end" value of a slider control?

Hi, Mike -- I may not be totally understanding what you are hoping to do, but would this info on Adding Sliders (specifically the section on setting slider properties) be of some assistance to you? If what you are hoping to accomplish is totally JavaScript related, unfortunately we would not be able to provide support and I would have to defer to your fellow community members to assist you further. :)

Sliders have an "End" value that is specified in the GUI when you create them. I was wondering if there is a player variable that is exposed, so that I can set that variable myself programmatically.

I'm embedding videos in my projects from Wistia, and it would be great to dynamically set that "End" value with the length of my video automatically, rather than have to manually enter it in the GUI for each video.

I see, Mike -- many thanks for the clarification and additional details! Hopefully someone here in the community can stop in to assist you further, but if not, please feel welcome to post your question over in the Building Better Courses forum as well to see if those folks can help out. :)