A SynthesizerModeDesc inherits engine name, mode name, locale and running properties from EngineModeDesc . Descriptor provided engines are obtained through the availableSynthesizers method of the Central class and must have all their features defined.
Applications can modify application-created descriptors in any way.
Engine creation is described in the documentation for the Central class. Create a fully-specified descriptor. Append a voice to the list of voices. Returns true if and only if the parameter is not null and is a SynthesizerModeDesc with equal values of engine name, mode name, locale, running, and all voices. Set the list of synthesizer voices.