Where can I find any recording of Roger Zelazny's voice on the Internet?

I'm a big fan of Roger Zelazny's work and, be it weird, I'd love to hear how he sounded. I've looked far and wide and was unable to find any resource though.

Are there any freely-available-to-everyone or available-to-everyone-who-pays clips of Roger Zelazny voice, preferably reading his own novels?