Abstract: An audio mixer provides a set of signal processing functions operative on one or more input channels and has a mixing board, a set of discrete channel selection controls, a set of adjustment controls, and a set of visual indicators. A controller circuit responds to the selection controls to change a mode of operation between at least first and second modes of operation, responds to the adjustment controls to set a value of each signal processing function, and provides display information to the visual indicators concerning at least one of the input channels and at least one of the output channels as a function of the operating mode. The mixer arrangement has the visual indicators dynamically displaying a characteristic of each of the respective input channels in the first mode and a value of the signal processing functions operating upon the selected input channel in the second mode.