You cannot run 64-bit plugins inside a 32-bit host. The Solution: You must find 32-bit versions of the VST plugins you wish to use. Many developers still offer "bridged" versions or legacy downloads for older plugins, but if you try to install the standard modern installer, it will fail to show up in your effects rack.
Start with GSnap . It is free, stable, and teaches you the fundamentals of pitch detection. If you crave the commercial sound, hunt down a legacy Auto-Tune 5 installer. Avoid modern subscription plugins—they will not work. Autotune Vst For Adobe Audition 1.5
Go to the Effects menu > Time and Pitch > Automatic Pitch Correction . You cannot run 64-bit plugins inside a 32-bit host
The most critical technical hurdle is . Adobe Audition 1.5 is a 32-bit application . This means it can only load 32-bit VST plugins . Modern Autotune versions (like Antares Auto-Tune Pro 11 or Celemony Melodyne 5) are exclusively 64-bit. They will not appear in Audition 1.5’s plugin list. Start with GSnap
Given the difficulty of sourcing legitimate licenses for Auto-Tune 5 (abandonware), consider these alternatives for pitch correction before importing audio into Audition 1.5: