Optional AudioOptional Content Specifies the type audio stream. This should reflect the
OutputFormat parameter in your request.
If you request mp3 as the
OutputFormat, the ContentType returned is
audio/mpeg.
If you request ogg_vorbis as the
OutputFormat, the ContentType returned is
audio/ogg.
If you request pcm as the
OutputFormat, the ContentType returned is
audio/pcm in a signed 16-bit, 1 channel (mono), little-endian format.
If you request json as the
OutputFormat, the ContentType returned is
application/x-json-stream.
Optional RequestNumber of characters synthesized.
Stream containing the synthesized speech.