Fix Vocal Pitch Without Adding Artifacts

Correcting pitch for a vocal track can drastically change its sound. Instead of a rich human voice, you’re left with a robotic mess. This doesn’t have to be the case. Some plugins are available that can correct the pitch of a vocal track and then re-humanize the sound, preventing the track from sounding like robotic, soulless perfection.
You can read the full article here: http://en.audiofanzine.com/recording-mixing/editorial/articles/transparent-vocal-pitch-correction.html