@realkimhansen @signlfm If you hadn't been aware, this came out earlier in the week and may be of overlapping interest:
Three recommendations to enable Annotations on the Web | W3C News https:/
Their method of breaking down the problem and their vocabulary may be particularly useful; the overlay onto audio may be another problem altogether...
I also thought this post (with code) by Aaron Parecki, while a relatively simple concept, was exceptionally cool. https:/