That method also prevents adding all that extra overhead and incredibly long loading times to your project. When you go back into AP9, your event is updated and tuned.
At the end there's a replace option on the menu. wav file name for each event, go out of AP and edit the file in Melodyne.
When I installed the Melodyne free trial it gave me the ability to run it in standalone mode so I just gave up trying to work with it while in Acid Pro 9. Good luck finding an email link or message contact link on this site anywhere.