The CNXASBK is an optional accessory designed to provide a clean solution for bussing together up to four CNXPAD8A audio distribution processors. One CNXASBK bussing kit must be purchased for each CNXPAD8A in the system. Each bussing kit includes a printed circuit board assembly, which installs in the CNXPAD8A providing a set of multipin bussing connectors on the processor's rear panel. A set of ribbon cables is also included, which tie between two stacked processors, effectively paralleling all eight inputs from the first processor to the next.