Voice user interface needs to output responses in TTS synthesized speech. Sometimes it is even more desirable to have the response in mixed languages, e.g. in a foreign country, it would be convenient if a user of car-navigation system who is not fluent in that particular foreign language can hear instructions in mixed-codes, i.e., entities like street names synthesized in the local language and routing directions in the user’s native language. The mixed-coded TTS can be easily built by a truly bilingual speaker. However, it is usually difficult to find such a talent. We demo a new approach in turning monolingual TTS into multi-lingual one. Out of a speaker’s monolingual recordings, our algorithm can render speech sentences of different languages for building mixed-coded, bilingual TTS systems. For this system, recordings of 26 languages are used to build TTS of corresponding languages. By using the new approach, any mixed language pair out of the 26 languages can be build.