I believe that touch screen is not good for real time performance. I like the control of newer GEM instruments as they are now. I like the fact that they have dedicated buttons to do the job and that the menus are not deep. The fact that they have 10 sliders makes them a superiour instrument to all. I actually wrote driver code for one touch screen and I can tell you that it is impossible to have the same reliability of touch as mere buttons and sliders.