In the first, select a language from "Language" list box in "Voice selection" frame. Then you'll decide who speak the language you selected. Choose an engine between "SAPI 4" and "SAPI 5". SAPI 5 is the newest standard which Microsoft releases. You may select it first. Then choose a voice from the list on the left side of "Preview" button. If you can't decide which voice can speak the current language you selected, you can check the box "Only show voices can speak the selected language". However, sometimes the voices who can speak the language don't appear in the list. When above steps are done, Press "Preview" button to preview the voice. If you don't hear the voice, maybe something wrong. In this case, you may check you audio device first.

If SAPI 4 or SAPI 5 engine is not installed in your computer, the radio button is disabled. You may download one. It's free.

In the "Parameter" frame, you can adjust the default rate and volume. SAPI 4 doesn't support volume, so just left it there.

You can repeat the steps above to set the settings of other languages.