Auto-Tune Pro (if you count versions--this would be 9) has a brand new GUI--a darker and sleeker look with a large piano keyboard at the bottom of the Auto page.

Immediately notable to me is the much easier and snappier workflow and the many more features included such as operating it in Classic Mode for that "Auto-Tune 5" sound.

This release includes ARA (Audio Random Access) suppor--so great for compatible VST3 DAWs that support it such as PreSonus Studio One 3 and 4 Professional.

Auto-Tune Pro has both Automatic and Graph modes plus Auto-Key detection to determine automatically what key the vocal (and track) are in. Since I have upgraded (to this version way before I wrote this review), I have gotten into saving in the new Settings menu my commonly used preferences--this can be for session-specific settings or global--over all sessions.

I mostly mix Pop music and it is not uncommon for me to see a dozen A-T Pro instances running on backing vocal tracks and various instruments--the producer just didn't have the time to render them out--I found it amazing just how CPU efficient this new version is.

Other new features include MIDI CC control of parameters in Automatic Mode and improved graphics via HiDPI support for Retina and other high-resolution displays. Now better than ever, Auto-Tune Pro will find more uses here for my mixing mostly vocal-heavy Pop productions. Recommended highly!