<p>The Seoul-based speech AI company ships its third generation of its on-device TTS engine, adding expressive tags, improved reading stability, and a 6× increase in language coverage — all while keeping the inference contract unchanged for existing integrations.</p> <p>The post <a href="https://www.marktechpost.com/2026/05/15/supertone-releases-supertonic-v3-on-device-text-to-speech-model-with-31-language-support-fewer-reading-failures-and-expression-tags/">Supertone Releases Supertonic v3: On-