MULTIVOX is a general purpose, multi-lingual, real-time text-to-speech (TTS) system for IBM PC and compatible computers in the following languages: Hungarian, German, Finnish, Italian and Esperanto. French, Spanish and Portuguese versions are under development. This system has been developed as a joint effort between the Speech Research Laboratory of the Technical University of Budapest (TUB) and the Phonetics Laboratory of the Hungarian Academy of Sciences (HAS). In this paper its implementatitonal aspects and a short description of its development system will be covered while its phonetic aspects are described in a separate paper.