The Text-To-Speech API supports the following list of parameters. The parameters have name-value pair (NVP) format.

The textual content for converting to speech (length limited by 100KB).

The textual content language. Allows values: see Languages.

The speech voice. Allows values: see Voices. Default value: depends on a language.

The speech rate (speed). Allows values: from -10 (slowest speed) up to 10 (fastest speed). Default value: 0 (normal speed).

The speech audio codec. Allows values: see Audio Codecs. Default value: WAV.

The speech audio formats. Allows values: see Audio Formats. Default value: 8khz_8bit_mono.

The SSML textual content format (see SSML documentation). Allows values: true and false. Default value: false.

ssml

Defines output as a Base64 string format (for an internet browser playing). Allows values: true and false. Default value: false.

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