I'm on the FreeVoiceClone team. Before generating a full tutorial voiceover, try a short test that includes your product name, one technical term, and a sentence with numbers. Those details can be harder to judge from a generic demo sentence.
Use your own voice, or one you have permission to use. Write the test line as you want it spoken, then generate a preview in the intended language. Listen for pronunciation, pacing, and whether the pauses make the meaning clear.
500+ languages is wild 😄 Really curious to see how natural the voices sound across different languages. Nice work and congrats on the launch!