Exemplary media content user interface systems and methods are disclosed herein. It then embeds the digital watermark signal at the selected orientation in the content signal. When a vacuum is drawn through the apertures in the platen, the polishing pad is drawn tightly against the platen and may therefore be less likely to wrinkle when a semiconductor substrate is engaged with the polishing pad during planarization. A computer program executable by the controller generates a position-varying target force band for the user over the range of motion, and a display is provided in communication with the controller and the force and position sensors for displaying the user-applied force as a function of position in real time in comparison with the target force band. An input shaft and an output shaft are in engagement to the first and the second rotors respectively with gears, and the output shaft is connected to the input shaft.