The Auto-Tune effect is probably the biggest decider when it comes to vocal processing. This is the slightly synthetic and quantised vocal sound that has been a chart staple in many dance and rap genres since Cher made the effect famous in the song Believe in 1998. As well-trodden and arguably worn out this effect is, you can't deny its continued popularity, and those predicting its demise have been many and all mistaken over the last couple of decades. With that in mind, then, an 'Auto-Tune' like plugin is a good tool to have in your armoury and at least four of our options will deliver it, from the simple AlterBoy right up to the one that started it all, Auto-Tune Pro.