Set the Attack to 0 or very fast and increase Sensitivity to 200 to force the voice to snap instantly to the nearest note.
When people say "Auto-Tune," they are usually referring to the software created by Antares Audio Technologies.
An older but reliable classic.
This native tool is excellent for subtle, invisible pitch correction (fixing a bad note). However, it struggles to create the hard, robotic "T-Pain" sound because the attack cannot be set fast enough. For that, you need a VST plugin.
The program includes a tool called .
: A lightweight and popular free pitch correction plugin that works exceptionally well with older software like Audition 1.5. Graillon 2 (Free Edition)