It’s easy to visualise how the panning of a point source, such as a snare drum, works in stereo , but what happens when your sound source itself is in stereo? Yes, you can pan the centre point of the image left to right, but you might want to have control of the width of that sound, for have that stereo source behaving more like a point source in the context of your mix. Within Cubase, there is an option that allows you to narrow the stereo field and pan it exactly where you want and how wide you want in your mix. And, should the need arise, to completely reverse the stereo image, putting the original left channel on the right and vice-versa.