What audio formats are supported by TTS?

What audio formats are supported by the method synthesizeToFile? The examples I read always refer to the WAV format, but I could not find a list of all supported formats. In addition, any supported audio files for playback engine TTS ( addEarconand addSpeech)?

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I expect that all you can get is WAV: looking at one version of the code , it seems like a return type PICO_DATA_PCM_16BIT(see line 656).

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