Offline AI Assistant's Voice Upgraded to Medium-Quality Lessac Model

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Developer Savindu Thathsara reports that his offline assistant, Hearthlen, now speaks with a new voice after replacing the earlier flat-sounding Piper en_GB-alan-low model. The new en_US-lessac-medium voice is a medium-quality narrator file about 63 MB in size, delivering slightly slower speech with a brief pause after sentences. A short greeting was synthesized and played back in about 1939 milliseconds, while a longer 3.21-second line took 3753 milliseconds. The listener process was restarted, and the new voice is now used for the "hey Hearthlen" wake phrase. The post is part of a public log documenting his ongoing work building an offline AI operating system.

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