saby:

A long time feature request : the return of vst plugin compatibility.

Actually it is possible to use VST plugins in Studio.

Install the audio application to the normal VST folder and copy the .dll(s) to C:\Program Files...\Pinnacle\Studio xx\plugins\SystemAudio, or create a symbolic link to the VST dll or folder.

For restoration I use Acon Digital Restoration Suite as well as Equalizer - iZotope also works fine, but quite expensive.

Unfortunately there seems to a bug in Studio 21, where it is impossible to access the GUI for the selected plugin.