Akihiko Matsumoto has created one http://akihikomatsumoto.com/maxmsp/autotune.html (scroll to the bottom and you will see the download for the patch...if you don't read Japanese you can use translator for website itself, patch is pretty self-explanatory). Video of the patch in action also at the bottom of his page.

great thanks.

Hi, Is it possible to share the .maxpat of the Matsumoto's autotune ? I've just tryed to download it but I think the link was dead. Thanks

Link worked for me! Here is the file.

You are sharing a dead link, I just want to know how to auto tune a sound.

Perhaps the retune~ object would be of interest to you, Martin.

I did find the retune~ object, but I am having trouble figuring out how to make it alter the tone of a sound I am importing. I found that I can change the speed of an mp3 that I am using, which changes how it sounds, but it is not what I am actually trying to do. The demonstrations built into the retune~ object seem to only work with a kslider as far as I can tell. I asked my professor for help and he was not able to make the retune~ object alter the imported sound either.

hey, look closer at all the tabs of retune~ helpfile. it’s really designed to accomplish what you are trying to do. kslider does nothing more than output midi note and velocities numbers ; and retune knows how to interpret those midi notes ; but you have a lot of other different options to set the pitch map you want to retune your input sound to.