1) Operates off dual ± power supply which allows a large reduction in the number of coupling capacitors required. A built-in regulator makes it easy to construct a power supply system. 2) A two-line I2C BUS control decoder circuit is provided, allowing the various IC modes to be set using serial control. 3) A four line input switcher is included (tuner, BS, and line 1 / 2). The output switcher can switch between STREO, LEFT, and RIGHT, and Hi-Fi, MIX, and NORMAL, and a BS.