Purchase the Auto-Tune plugin from Antares (see "Resources").
Download and install Antares Auto-Tune on your computer.
Launch Cubase 4 and open an existing project or create a new one.
Go to the "Inserts" panel and click on a blank channel. See AutoTuneVST in the list of plugins that displays. Click on it to open Auto-Tune. If AutoTuneVST was included in your list of plugins, apply Auto-Tune to any track you want. If you do not see the plugin, continue on to steps 5 to 7. You must tell Cubase where it is.
Click on the "Devices" menu and choose "Plugin Information." A new window opens.
Click on the "VST Plugins" tab and choose the "Add" button. A search window opens.
Locate Antares Audio Technologies and expand it to view the sub-folders. Click the sub-folder "Auto-Tune VST" and select "OK." You can now apply Auto-Tune to your Cubase tracks.