1) The Voices Folder has been moved or deleted from the Extensions Folder of the System Folder. The Voices Folder is required for the Text-to-Speech software to operate. Reinstalling the Text-to-Speech software will get the voice files back.
2) You have the Text-to-Speech portion of PlainTalk 1.4 installed. In order to have the Speakable Items (as well as Listening and Feedback) options, you need to install the Speech Recognition software.
3) You have the Speech recognition portion of PlainTalk 1.4 installed. To get the voice option within the Speech control panel you need to install the English or Mexican Spanish Text-to-Speech software.