The vocal is at the center of every one of your recordings. That means if your vocals sound bad, your whole project sounds bad. While nothing can replace a killer performance by a talented vocalist, there are scores of plug-ins available that will tune, fix, tweak, and polish your vocal tracks to perfection.
The Antares Auto-Tune Pro is arguably the world’s best-known vocal plug-in. Even folks who know nothing about audio engineering have heard of it. The Celemony Melodyne 4 editor is the industry’s other top dog when it comes to vocal pitch correction.
Read more about this here: https://www.sweetwater.com/insync/best-vst-plug-ins-vocals/