The Problem: You have a stereo track and it has to be converted to 5.1. You can spend a lot of time to add surround reverbs to your stereo master, but it will never fit and you will never get a satisfying result, because all you do is "torture" your old mix. The 2-2-SiX doesn´t add phasers, reverbs or delays to your Stereo signal. 2-2-SiX recalculates existing room informations from stereo to 5.1, the base stereo signal will be untouched.