A graphical user interface is disclosed for controlling a harvesting system, the harvesting system driving each of two shaking actuator frequencies individually, the user interface setting or displaying the frequencies of the two actuators as a single point on a display—a Frequency-Frequency User Interface (FFUI). The FFUI abstracts the tuning process of shaking with independent frequency control, allowing a user to choose the parameters for shaking the tree, e.g., frequencies, duration at a given frequency, etc., all while observing the effects of the shake taking place on the tree. The FFUI employs user gestures to map the shaker eccentric speeds and directions to the x and y coordinates of a graph, with the length of time a user gesture remains at any given coordinate pair determining the time that the first and second eccentric frequencies are driven according to the values of the given coordinate pair.
