Adobe Audition 1.5 includes a native effect called . This is the quickest way to get the "autotune" sound without downloading external files.
: Download the .dll file (for GSnap) or run the installer (for Graillon/MAutoPitch). download autotune adobe audition 15 pc free
Go to the Effects menu > Time/Pitch > Automatic Pitch Correction . Adobe Audition 1