//ibm watson tts
const TextToSpeechV1 = require('watson-developer-cloud/text-to-speech/v1');

const textToSpeech = new TextToSpeechV1({
    username: "key",
    password: "pass"
});

var params = {
    voice: 'pt-BR_IsabelaVoice',
    accept: 'audio/wav'
};

//ibm watson tts

params.text = result;
const transcript = textToSpeech.synthesize(params);
transcript.on('response', (response) => {
        response.headers['content-disposition'] = 'attachment; filename=transcript.wav';
});
transcript.on('error', next);
transcript.pipe(res);