For links directly to audio files, we are currently using templates with
loudspeaker icons in the Image: namespace. This is a bad solution, since most
people click on the image and end up at the image page.
I think it would be relatively easy to modify the code that adds icons to
external links, news links, secure links, mailtos and the like, and add the
loudspeaker icon to links with audio file extensions.
The only difference is that we would like a way to link only the loudspeaker,
and not include any other text, for inline pronunciation examples and the like.