How can i get autotune to work instantaniusly (speak into it and it can change your voice) I have Fl studios 8?

How can i get auto tune to work instantaneously (speak into it and it can change your voice) I have Fl studios 8 with the auto tune plug in but i can not figure out how to do this. PS. I think the problem has to do with the fact that i need some hardware such as an external sound card. If anyone can confirm this and tell me how i can do this it would be much appreciated.