M/S is a stereo technique which is used in almost all of Brainworx (BX) audio plug-ins. The BX saturator is a M/S 2-band saturation tool (4 bands in total). Every band has its own parameters for amount of distortion (called XL), distortion drive, pre/post options as well as saturation compensation settings. In addition you have at a global level a master XL parameter as well a master drive parameter. For both the M and S channels you have two separate crossover selections as well as separate gains. For convenience there is an added mono-maker with a frequency control parameter.