5 discrete partylines Lights, Sound, Cameras, Stage Management, Artist Liasion, all communicating amongst themselves whilst also listening to a single showcall channel. Production Departments using Walkie Talkies were directly addressable from any panel and also able to call in to thosepanels or partylines depending on the flexible and adaptable programming of the Matrix. This design linked Reidel Panels, 2Wire Reidel Digital Beltpacks, RTS Beltpacks, Clearcom Freespeak II Wireless Beltpacks, Motorolas and the Broadcast trucks with their Telex communication system.