The aim of the plugin is to increase the stereo image of mono tracks and help to place the sound in the right place by the use of dedicated internal filters and pan controls. The idea behind it is very simple yet effective and adds to the sound a pleasant stereo effect.
The best way to use this plugin is with mono tracks. It's possible to switch the main input from mono to stereo (for example if you want to use it on the main mix).
Sturiophonia is available for free at maxsynths.com.