Gets available preview voices for the speech provider selected in the Project settings.
Supply the API Key in the HTTP-Header
Supply the API Key in the Url-Query
The access token received from the authorization server in the OAuth 2.0 flow.
The default media type is application/hal+json. Use application/json for pure data results.
application/json, application/hal+json, application/xml, text/xml, text/csv Project id from which it will get the settings
Returns the available audio preview voices