If you don't want to install third-party plugins, Adobe Audition does have a built-in tool that can be used for tuning, though it is not "real-time":
Always match the plugin's scale to your instrumental.
While the official Antares Auto-Tune is a paid industry standard, several high-quality, free alternatives can give you the exact same professional sound within Adobe Audition. The Reality of "Free Auto-Tune" Downloads
Antares Audio Technologies, the makers of Auto-Tune, offers a of its software. This is the real, uncracked software with all the professional features, including the latest Auto-Tune Pro 11 and the new Auto-Tune 2026.