I agree that the SX900 isn't that great for making changes on the fly. With the S970, the mixer was on the home screen, and I knew exactly where each of those grey buttons were to fine tune the volume of the RH voices, mic, and style. Now, I have to hit a button that brings me to the touchscreen, and the mic volume slider is on the second page. Of course, there are Live control knobs and assignable buttons. The bottom line is that you have to get everything right in your registrations to avoid being confused during the performance.