How do you use Auto-Tune in FL Studio?

Answer 1

If you are referring to Antares Auto-Tune, then it is a matter of getting Antares to "learn" the notes and scales on an instrument playing them. Once Antares learns the scales, you can then remove the instrument, keeping the Antares plugin active in the mixer and assign your vocal track to that mixer channel.

If you like, you can use the Antares basic automated features to decide what scales and notes are needed or not so that any sound playing will tune automatically. This is not perfect, but it does the job closely enough as long as the sound being auto-tuned is not so very out of tune. There needs to be at least some note holding ability. It won't make someone tone deaf sound good, it will only finely tune vocals that are only just out of tune.