Audio and video equipment, namely, amplifiers, mixers, sound filters, equalizers, encoders, decoding apparatus, microphones, microphone arrays; gain and noise control units, namely, electronic and microprocessor controllers for audio equipment; networked digital signal processing system consisting of computer hardware and software used to capture, condition, and transmit audio and video signals; recorded software and computer hardware for controlling, managing and monitoring room, lights, audio, video, and the room environment; analog and digital equipment used to capture, amplify, modify, combine, process and transport audio and video signals, namely, amplifiers, digital audio signal processors, mixers, microphones; network based paging and background music system with life safety and mission critical paging capabilities, comprising computer hardware and operating software therefor