Indeed, like liz
already explained (but I would just like to confirm it here): the text you see on the buttons are the default text that is fed to the speech synthesizer. You can however also enter a 'phonetical text', which you can enter in any way you like to make it sound right.
This is not always needed. The BrightSpeech synthesizer liz
mentioned (the Flemish speaking female) has a phonetical lexicon which you can feed, so you don't need to enter a specifical phonetical text.
Jouke Visser, Perl 'Adept'
Using Perl to help the disabled: pVoice and pStory