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Sourashtra_Vits_TTS_Models

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At length_scale 1.0 the models speak too fast. This sets model_args.length_scale in each config.json:

• Male (Tamil and Sourashtra script): 1.43 (target 0.7x of the current speed)
• Female (Tamil and Sourashtra script): 1.11 (target 0.9x of the current speed)

inference.py reads the value from config.json, so no code change is needed. Only this one value changes in each config. The README gets a short Speaking Speed section explaining it.