The S2-M6SS source selector panel produces a stereo analogue audio output from 6 selectable stereo analogue sources, which can be connected to a stereo input channel in the console, or to the EXT 1 and EXT 2 monitor inputs, to provide up to 12 external monitor inputs. There are 6 illuminated push buttons that select and indicate the current channel selection. The 6 stereo sources are connected to the rear of the panel via a connector that uses exactly the same pin configuration as the stereo audio source input connector on the S2-C6SS channel.