Thanks, Torben. As i could read about it festival works with MBROLA system and the voices database that project already has. It sounds very interesting.
Here in Brazil one of our federal universities - Universidade Federal do Rio de Janeiro - is developing a software called SINAL - Sistema Interativo de Navegação no Linux (Linux Interactive Navigation System) to enable web accessibility to users who are blind. SINAL is going to use MBROLA as far as i know.
link to MBROLA voices database:
http://tcts.fpms.ac.be/synthesis/mbrola/mbrcopybin.html
link to MBROLA project website:
http://tcts.fpms.ac.be/synthesis/mbrola.html