Let’s try a Tippy embed using html5 short code:
Here is a standard audio embed using the shortcode:
Here is by far the best tooltip plugin choice: “Tippy” for WordPress … a very good-looking plugin that allows html styling in the tooltip content:
And here is some text below the SoundCloud player. Might this work as a caption, once styled? Why yessir, it works great, doesn’t it?
Here is an embedded recording using the WP 3.6 audio shortcode: