The location for for the article is in Database > Articles & Interviews > under the Behind the Scenes category for those that can't find it.
I've searched everywhere in my archives to find audio files for those radio snippets, but I had no luck. So if anyone finds it, contact me.
Also, incase anyone misses it in the huge response from Jeff on that page: Those audio messages were actually made by fans. Rachel and David (not the characters, but the ones who worked at Morphz) were going to record them from the tiny scripts Jeff made, but since Rachel couldn't go, it ended up being David and his cousin Erin who recorded them. They were the same ones posted on AniXtreme and on the radio, I believe.