Set it to zero and you get that iconic unnatural note-hopping the higher you raise it beyond that, the more natural the slides from pitch to pitch sound.
The first is Retune Speed, which allows you to set, in milliseconds, the speed of the pitch correction. There are just two new features in EFX 3, both of which have been brought in from the full Auto-Tune 7. One thing Auto-Tune EFX has never been great at, though, is creating natural-sounding vocals - and its this shortcoming that version 3 seeks to address first and foremost.
These produce fairly impressive (if unnatural) flourishes and patterns of the type you've undoubtedly heard in action on a variety of hits and club classics over the last few years. Auto-Tune EFX 2 introduced Auto-Motion, which enabled prescribed musical tuning patterns to be triggered (there's a substantial list of presets, and you can program your own using a musicXML editor), based on the pitch of the audio it's receiving when the trigger is engaged.
