Real Voice is a versatile text-to-speech plugin for WordPress. It supports all the major text-to-speech services in a single convenient $29 package. It comes with a customizable audio player, a dedicated dashboard to monitor the API calls to the text-to-speech services, and many customization options.
The customization options made available by SpeechSynthesis are available in the Real Voice plugin settings:

• Language – With this option, you can select the language of the utterance.
• Voice – Select one of the voices available in the user’s browser.
• Pitch – The pitch value determines the perceived “highness” or “lowness” of the generated voice.
• Rate – Select the speed at which the utterance should be spoken.
• Volume – This determines the volume value