Becky,
Windows 8.1 comes with three SAPI voices. David is the default U.S.
English voice. The other two voices are female, one U.S. and the other
UK. I can use them with Jaws and NVDA, so I assume you can use them with
System Access. The voices are high-quality, but they're less responsive
than Eloquence or eSpeak. I use NVDA with David. I don't notice the
lagginess right away, but after a while, I find myself getting annoyed
with it.
I know you can get Ivona and one other TTS for Windows, but last time I
checked, they cost two or three hundred dollars, so I've never tried
them. Maybe you can ask Serotek if the company sells additional voices
for System Access.
Ciao
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