digital audio routers, expansion routers, electrical source input wall plates, remote control transmitters, and amplified computer touchpads and keypads, all of which provide digital plug and play compatibility through proprietary audio distribution technology; audio system, comprising digital audio routers, expansion routers, electrical source input wall plates, remote control transmitters, and amplified computer touchpads and keypads, which provides digital plug and play compatibility through proprietary audio distribution technology; central intercom systems and central stereo music systems comprised of speakers, receivers, transmitters, wire and master control panels for distribution of sound; audio speakers; parts and accessories therefor, namely volume controls, subwoofers, volume controls, remote controls; intercoms; electrical and wireless electrical doorbells; intercom and doorbell stations; electronic and wireless electrical control systems for residential or commercial controlling of audio systems, doorbells, and intercoms