===== 6.2.1.2. Synthesizer Selection The Synthesizer dialog, which is found under "Synthesizer..." in the Preferences menu or by pressing NVDA+Control+S, allows you to select which Synthesizer NVDA should use to speak with. The dialog contains a simple combo box, which lists all the available synthesizers. Choose the synthesizer you want using the arrow keys, and then press ok. If there is an error loading the synthesizer, a message box will alert you, and NVDA will keep the old synthesizer loaded. The current list of synthesizers NVDA supports is: eSpeak, SAPI4, SAPI5, Audiologic, Display, and Silence. The eSpeak synthesizer is built directly in to NVDA, and does not depend on any other special drivers or SAPI runtime to be installed. NVDA starts using eSpeak by default. This synthesizer should work on any system that NVDA works on, so it will definitely work when running NVDA off a USB thumb drive or CD, on anyone else's system. The Sapi4 option allows you to use the Ssapi synthesizer. Voices that are included under Ssapi4 include eloquence voices, as well as other Ssapi4 voices that you may have installed on your system. The Sapi5 synthesizer allows you to use the microsoft voices that are iincluded on your machine. In XP, the default Ssapi5 voice is Microsoft Sam. In Vista, the default voice is Microsoft Anna. Depending on what voices you have installed, others may show up under Ssapi5. The Display synthesizer is useful for sighted developers who wish to read what NVDA is speaking, as they test NVDA with their applications. The Silence synthesizer driver is not that useful, unless you want to not have any speech at all while running NVDA. Please note that no matter how many different SAPI4 or SAPI5 voices (or engines) you have installed on your system, only the actual SAPI4 and SAPI5 synthesizers will show up in the Synthesizers dialog. To actually select one of the engines (voices), select either SAPI4 or SAPI5, and then in the Voice settings dialog, you can choose the voice you want.
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