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User interfaces

Q: How is the speech signaling carried out and what is needed for its work?
Re: The speech signaling, as well as other methods of the signaling, is an element of the subsystem "User interfaces" and organized into the modules of visual control area (VCA), and exactly into VCA engine modules UI.VCAEngine and visualizers UI.Vision and UI.WebVision. Usually, for synthesizing the language, you need a synthesizer with the support of the desired language. But to play the synthesized sound, you need the play program that is typically contained in the sox package, and for precise definition of the dependencies, see the relevant external notification methods.