The Model K is a physical interface, resembling a keyboard, for all networkable Dugans including the models M and N. It gives the users physical buttons for controlling a system so operators can have their eyes on the production and their fingers on the keys. The Model K includes Manual, Automatic and Mute keys for each channel, plus rotary encoders for setting Weights and other values, and LCD displays for channel names and parameter values. The brightness of indicators and displays can be adjusted for dark or bright environments. The Model K can control any number of channels, presented in blocks of eight and three groups. The Model K can be linked to a particular instance of a Dugan Control Panel so the tactile panel and computer display complement each other.