My 6 cd changer (I have one installed from the factory) doesn't support CDText, MP3 reading, and other features. Is there a way to enable this in the changer? Would purchasing another changer fix these woes?
No, the Audi CD changer interface does not support any of those features. And unless someone (Hello, Audi?) comes up with a solution that works similar to the US SAT radio integration, this won't happen anytime soon.