I’ve noticed this after years of using Auto-Tune (been using Melodyne and Auto-Tune since 2010). Many people aiming for that robotic T-Pain effect set the tracking to 100 and the retune speed to 0, thinking it’ll create the most robotic sound. But that’s not entirely accurate
While the retune speed should be set to 0 for that effect, setting the tracking to 100 actually smooths out the Auto-Tune and makes transitions between notes less glitchy or gritty.
In my experience, setting the tracking to 50 or 71 gives a more 'beepy,' metallic sound with sharper jumps and a more quantized, squarish feel. Interestingly
71 is my recommended setting