You are designing the audio system for a very large restaurant that includes a large lounge area. The lounge includes many entertainment options for its patrons—big screen sports from a satellite TV feed, a variety of music channels fed into a powerful speaker setup, and, on occasion, live rock or acoustic music concerts. There are, therefore, many different sources requiring volume control. The restaurant owners want the lounge personnel to have easy control over the volume of each of these sources. On some evenings, one source is more important than the others. For example, during the NCAA March Madness, the TV sports take precedence.