SpeechSynhtesis... is it possible to add new voices to windows?

Hello, i just found the node SpeechSynhtesis, i did´t know that vvvv had this feature, its great!. My question is more windows related than vvvv related, is it possible to add new voices insted of MicrosoftAnna on windows seven ?
im looking for any Spanish narrator… how can i do that ?

yep, all voices and languages supported by the windows speech app
also works with vvvv!