In this project, the HCI area of La Salle R&D has developed the first software that generates customizable synthetic voice messages through the combination of text-to-speech (TTS) synthesis and voice transformation (VT). This technology produces synthetic speech from any input text using a simple user interface designed to intuitively modify voice personalization parameters. Different user-defined voice presets can be generated and saved for future. The technology is a multi-platform software implemented following a client-server architecture. Speech synthesis is done using a TTS system installed on a server that receives requests from the client application, while voice customization is performed by the voice transformation module running in the client application. A non-expert user can easily define, modify and save, the specific settings of each voice preset using a graphical user interface (GUI).