The main reason why we enabled customizing TTS is that TTS engines do not pronounce numbers correctly in some languages. Therefore we created our own system where all texts are stored in text files in usable format prepared for reading. Another advantage of this system is that you can customize the TTS files as you like.

The TTS files are available for customization at a shared Google Drive.

• download required file from the Google Drive
• modify its content
• upload modified file into Locus/data/tts directory - no matter if there is a TTS file in the directory - Locus will prefer your file.
• choose modified language in Locus Settings > Language&Units > TTS settings