The C8082 module performs automatic or manual switch over or fail over in case of input level loss and ducking of a main stereo or surround sound signal by a line level microphone or by a pre recorded announcement/advert input. It offers different types of fail/switch over (5.1 to stereo, 2xStereo) and similar associations for Ducking (5.1 to C, L&R or L&C&R; and 2x stereo ducking). The inputs of the C8082 are equipped with level detectors for either detecting a loss of the input or an active source for ducking. The fail/duck detection part performs the logical action depending on the various input statuses and user defined operating modes. The C8082 provides 4 audio buses for 5.1 or multiple stereo processing. In the switch over modus, the DSP monitors a certain number of sources, and when detecting an absence of or low input level on one of the targeted sources, the C8082 performs automatically a fail over switching. 6 channel outputs feed the processed signals back to the C8000 frame bus. Each of these 6 outputs has the Junger Brick wall limiter with look ahead function inserted. This limiter not only provides smooth non distortion output in case of an overload but also defines the maximum output level. The algorithms are adaptive to the material so only one parameter, the Limiter Program, is needed to set up this part. For 5.1 or stereo processing the limiters control circuits are automatically linked together for proper multi channel operation.