The number of available voices in a speech-to-text library typically depends on the language models and acoustic models used in the system. However, the availability of voices may also be impacted by the licensing and data restrictions of the specific toolkit.

Among the speech-to-text libraries mentioned, CMU Sphinx and Kaldi are designed to support multiple languages, and they may have more pre-trained language models and acoustic models available for different voices.

However, it's important to note that the availability of different voices may vary depending on the specific application and the quality of the audio being processed. In general, it's recommended to evaluate the accuracy and suitability of each toolkit for your specific use case, rather than solely considering the number of available voices.
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