You can always replace Serena and Daniel's dictionary.voice with Universal Unisex's and see if they improve.
It also performs this function, but it would not be the main one, there are other engines to listen to the Vocalizers.It is what I currently use on Vocalizer EX.
The Universal Unisex would be used to listen to the system voice when there is only Google's voice.
Try setting up Google speech synthesis as your default engine and see its quality level compared to the voices of Serena and Daniel.
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