text to speech - Watson TTS doesn't allow to choose voice -

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created bluemix app proper credentials , using fiddler text speech(tts) record prompts. recordings use default "michael" voice. want allison.

if try passing in "voice", following error, when specify "michael" choice: 

{   "code_description": "bad request",   "code": 400,   "error": "the argument(s) [u'voice'} not allowed." }

this payload:

{ "text": "hello,, dora. how today?", "voice": "en-us_allisonvoice" }

i have developer account, need sign use "voice"? if pass in default "michael"?

i think problem in way specifing voice parameter.
voice , text parameters can send query parameters in get.

examples

1. curl

curl -u "{username}":"{password}" "https://stream.watsonplatform.net/text-to-speech/api/v1/synthesize?voice=en-us_allisonvoice&text=hello%2c%20this%20is%20dora.%20how%20are%20you%20today%3f"

node

var watson = require('watson-developer-cloud'); var fs = require('fs');  var text_to_speech = watson.text_to_speech({   username: '<username>',   password: '<password>',   version: 'v1' });  var params = {   text: 'hello, dora. how today?',   voice: 'en-us_allisonvoice',   accept: 'audio/wav' };  // pipe synthesized text file text_to_speech.synthesize(params).pipe(fs.createwritestream('output.wav'));

see text speech api reference more examples on how call service.
try example above here: 

https://text-to-speech-demo.mybluemix.net/api/synthesize?voice=en-us_allisonvoice&text=hello%2c%20this%20is%20dora.%20how%20are%20you%20today%3f

powered demo app: https://text-to-speech-demo.mybluemix.net


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