** Lists the features of phonemes and visemes.** ** `http://msdn.microsoft.com/en-us/library/ee125218%28v=vs.85%29.aspx` enum class SpeechVisemeFeature {** Indicates that a viseme or phoneme has no stress or emphasis.** ** Value is 0 (0x0) SVF_None,** Indicates that a viseme or phoneme is stressed relative to the other phonemes within a word.** ** Value is 1 (0x1) SVF_Stressed,** Indicates that the word containing the viseme or phoneme is emphasized relative to the other words within a sentence.** ** Value is 2 (0x2) SVF_Emphasis;}