Audacity is a very effective program when it comes to audio and top of that it is free. Download Audacity from its home page, get the newest version because only that one will work with what we need to do. Install it when done with the downloading. Now the first step to installing auto-tune is getting the Audacity VST enabler, you need to need place this right or it will not work, it needs to go into the plug-ins folder in the Audacity installation folder. Now you need to get auto-tune evo from the antares site, download the one which applies to you. Install this to the same place and then restart your computer. After you restart, the auto-tune option should appear now in Audacity.