M-ST is a quick and easy way of changing the stereo wideness of an audio signal or faking a stereo-signal from a mono audio. Just select what kind the input is and adjust the width of the signal – from mono to original or wider. Unlike a mono-stereo switch the channel separation can be continuously adjusted. Above 100% the stereo signal is spreaded with M/S techniques first and then additionally with filter and delay lines. The resulting signal is still mono compatible. A mono input can be turned into a fake stereo signal with similar technique. And the best of it all: this plugin is totally free !