Storyline Progress Indicator - again

Hi,

After lurking for some time, this is my first post.

I have read a number of posts on how to track progress in Storyline. In less I missed that one "right" post, the only solution to finely track (every slide visited) is to have and set a unique true/false variable (flag) on every slide you want to track.

I have already implemented tracking sections by setting flags on a couple of slides in each section, but I am looking for a finer way to track progress.

Storyline already keeps track of the slides visited in order to inform the LMS when a course is completed. So is there a player function that can be called with JS to get this information, either how many slides have been visited, or better yet, which slides have been visited?

Thanks!