podcast of the Vatican Museum?

It's hard for most podcast/audio tours to do the Vatican Museums since the path changes often. One year we were sent in one direction through the map room and the next visit we went the other way. The audio guides you rent at the Vatican Museums utilize numbers on pieces or in rooms to deliver the information to you. I've never found a reliable Vatican Museum audio guide or podcast, would love to find one someday as the rented audio guides get a little dry after a while.