A method of operating a UI for controlling a virtual musical instrument implemented on a display can include receiving an input corresponding to a selection of one of a plurality of dynamic navigation objects configured on the display, the display including a cell matrix including one or more arrays of cells configured as a step-sequencer. The method can further include displaying a first portion of the cell matrix in response to a first dynamic object being selected, such that the first portion of the cell matrix is visible and the second portion of the cell matrix is not visible in the predefined area, and displaying a second portion of the cell matrix in response to a second dynamic object being selected, such that the second portion of the cell matrix is visible and the first portion of the cell matrix is not visible in the predefined area.