RealSpread 64 is an Audio Plugin (VST 64-bit - Windows) which "Stereoizes" a mono audio signal or widens a stereo one, without practically compromising mono compatibility. The spartan GUI conforms to my philosophy of simplicity in plugin design.
You can insert a Goniometer / Lissajous pattern plugin on the Master bus if you want to observe the effect...
Download the dll file here and put it in your VST Folder.
Enjoy and feel free to share.