This is the first setting you should adjust. It tells the plugin what kind of sound to expect.
. This forces the pitch to change instantly, creating the famous stepped, robotic sound. For Natural Vocals : Increase the Retune Speed (around 20–50ms) and use the autotune evo vst full
However, modern Auto-Tune Pro is objectively better. It has lower latency, better vibrato control, and Flex-Tune for natural singing. Evo sounds "vintage" now—like using a Motown reverb or an SP-1200 sampler. This is the first setting you should adjust