I put the french in because Xaviers face was hilarious when it tried to read french using the english rules, but on his computer (which is set to use french) it had a surprisingly good french accent.
Mark,
The browser speech synthesis is supposed to use the system speech synthesis according to the documentation. So I assume that means that the system has to have them, it worked out of the box for everyone who tried to use it here. It worked on Mats windows laptop but I am not sure what version or browser he was using. I will ask him today and see if I can find what needs to be installed to make it work.