Did you ever wish the FSI audio tapes were somehow linked directly to the text?
I've figured out how to do it.
It is called a pencast, and it is a PDF with linked audio.
I have created some prototypes, and uploaded them to my website, Kenwood Polytechnic (tinyurl.com/pencasts)*.
*If that link doesn't work, use https://sites.google.com/site/kenpolmed/pencasts.