A1StereoControl, a free stereo enhancer vst effect plug-in for Windows.
With the A1StereoControl plug-in you will be able to expand or limit the STEREO WIDENESS of your tracks using only one single knob. This powerful technique can be used on single tracks or groups tracks while mixing or even on a master bus in final mastering situations.
As many experienced mixing & mastering engeneers worldwide are complaining, stereo-expansion can have unwanted side-effects. Especially the bass frequencies should normally be simple mono.