This nice little tool can be used for a wide variety of sophisticated applications, such as chaining ANY stereo plug-in (even tools from other manufacturers) into a Brainworx M/S matrix (you need to use 2 instances of bx_control before and after the plug-in(s) that is / are to be "chained" into the M/S matrix), control the STEREO WIDTH of full mixes in mastering sessions or single stereo signals in mix sessions, mono-ing out bass-frequencies of stereo mixes / signals with our unique MONO MAKER tool, plus SOLO listening to M (mono sum), S (stereo difference signal), L (left channel) or R (right channel) phase-corrected ans mono-ed on BOTH speakers with its 4 dedicated SOLO BUTTONS, another Brainworx invention. Easily SWAP channels with its L/R flip button.