Oops!
Sorry about that. I had inadvertantly lowered the output volume on GarageBand instead of lowering the main volume on the Mac.
If you're in iTunes, right-click on Episode 8 from your Podcast list, click "Clear", and when it asks you to delete the file on your hard drive, say yes. Then right click on the "World of Warcast" podcast title and select "Update Podcast". That should get you the new version.