NHMTTS SAPI5 is able to convert into male or female voice a Vietnamese text. It very faithful in its voice reproduction because it respects the duration, times of pause or amplitude for a better understanding. It is based on the technology of the artificial neural networks, one of best in the field. It supports SAPI5interface. It is able to work with non-Vietnamese texts which are in Unicode. It is possible to change volume, speed and tonality to fit your preference. You can handle and change them on the fly. Its graphics interface is easy to understand which simplifies its use.