With that in mind, we made a list of the top 5 free vocal tuning plugins. Whether used for corrective tuning, to generate unnatural and unique harmonies, to shift a vocal formant at a key point in a song, or simply to evoke a sense of modern production, engineers will need to become squinted with the effect. There’s no doubt that the effect is here to stay. Autotune has been established as a popular and creative effect.