The keyboards had speakers because at that time not many business PCs had speakers connected if they had soundcards. This provided a physical volume slider to l

The keyboards had speakers because at that time not many business PCs had speakers connected if they had soundcards. This provided a physical volume slider to listen to news out loud as well as a headphone/mic jack for private listening. Later uses allowed using the mic for squawkbox like functionality communicating between employees on various desks. The Terminal has had streaming audio and video since forever now. (Audio use cases involve things like earnings calls, investor relations as well as news.) Aside from A/V, the Terminal also has had text to speech for news for a very long time as well.