diff --git a/README.md b/README.md
index e389819e..a8aebb9b 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@ Node-RED Watson Nodes for IBM Bluemix
 <a href="https://cla-assistant.io/watson-developer-cloud/node-red-node-watson"><img src="https://cla-assistant.io/readme/badge/watson-developer-cloud/node-red-node-watson" alt="CLA assistant" /></a>
 
 ### New in version 0.4.14
+- The dialog for the Test to Speech service now loads available voices dynamically. This allows
+new voices and languages to be identified without requiring a further code change. 
 
 ### New in version 0.4.13
 - Emergency fix for Watson Language Translation node. Bluemix credentials read too late.
diff --git a/services/text_to_speech/v1.html b/services/text_to_speech/v1.html
index 4e465b7c..bc5bce71 100644
--- a/services/text_to_speech/v1.html
+++ b/services/text_to_speech/v1.html
@@ -20,6 +20,11 @@
             <i class="fa fa-question-circle"></i><b> Please wait: </b> Checking for bound service credentials...
         </div>
     </div>
+
+    <div>
+        <label id="node-label-message"><i class="fa fa-exclamation-triangle"></i></label>
+    </div>
+
     <div class="form-row">
         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
         <input type="text" id="node-input-name" placeholder="Name">
@@ -35,28 +40,19 @@
     <div class="form-row">
         <label for="node-input-lang"><i class="fa fa-language"></i> Language</label>
         <select type="text" id="node-input-lang" style="display: inline-block; width: 70%;" >
-            <option value="english">English</option>
-            <option value="german">German</option>
-            <option value="french">French</option>
-            <option value="spanish">Spanish</option>
-            <option value="italian">Italian</option>
+
         </select>
     </div>
+    <div class="form-row">
+        <input type="hidden" id="node-input-langhidden"/>
+    </div>
     <div class="form-row">
         <label for="node-input-voice"><i class="fa fa-comment"></i> Voice</label>
         <select type="text" id="node-input-voice" style="display: inline-block; width: 70%;">
-            <option class="english" value="en-US_MichaelVoice">Michael (Male)</option>
-            <option class="english" value="en-US_LisaVoice">Lisa (Female)</option>
-            <option class="english" value="en-US_AllisonVoice">Allison (Female)</option>
-            <option class="spanish" value="es-ES_EnriqueVoice">Enrique (Male)</option>
-            <option class="spanish" value="es-ES_LauraVoice">Laura (Female)</option>
-            <option class="spanish" value="es-US_SofiaVoice">Sofia (Female)</option>
-            <option class="french" value="fr-FR_ReneeVoice">Renee(Female)</option>
-            <option class="italian" value="it-IT_FrancescaVoice">Francesca (Female)</option>
-            <option class="english" value="en-GB_KateVoice">Kate (Female)</option>
-            <option class="german" value="de-DE_DieterVoice">Dieter (Male)</option>
-            <option class="german" value="de-DE_BirgitVoice">Birgit (Female)</option>
-        </select>
+         </select>
+    </div>
+    <div class="form-row">
+        <input type="hidden" id="node-input-voicehidden"/>
     </div>
     <div class="form-row">
         <label for="node-input-format"><i class="fa fa-file-audio-o"></i> Format</label>
@@ -71,14 +67,7 @@
 <script type="text/x-red" data-help-name="watson-text-to-speech">
     <p>The Text To Speech service understands text and natural language to generate synthesized audio output complete
     with appropriate cadence and intonation.</p>
-    <p>You can choose from eleven different voices from three languages:</b>.</p>
-    <ul>
-        <li><b>English</b> Male and Female.</li>
-        <li><b>Spanish</b> Male and Female.</li>
-        <li><b>German</b> Male and Female.</li>
-        <li><b>French</b> Female.</li>
-        <li><b>Italian</b> Female.</li>
-    </ul>
+    <p>You can choose different voices for a range of languages:</b>.</p>
     <p>The text to be converted should be passed in on <code>msg.payload</code>.</p>
     <p><b>The source text must be in the language which matches the chosen voice, i.e. you cannot choose to a Spanish
     voice with English text.</b>.</p>
@@ -87,18 +76,264 @@
 </script>
 
 <script type="text/javascript">
+
+  // Need to simulate a namespace, so that some of the variables don't leak across nodes
+  function TTS () {
+  }
+
+  // This is the namespace for tts.
+  var tts = new TTS();
+  //tts.language_selected = '';
+  //tts.voice_selected = '';
+  tts.LANGUAGES = { 'en-US': 'US English',
+                    'en-GB': 'UK English',
+                    'pt-BR': 'Portuguese Brazilian',
+                    'fr-FR': 'French',
+                    'it-IT': 'Italian',
+                    'de-DE': 'German',
+                    'zh-CN': 'Mandarin',
+                    'es-ES': 'Spanish',
+                    'es-US': 'US Spanish',
+                    'ar-AR': 'Arablic',
+                    'ja-JP': 'Japanese'
+                  };
+
+  // Called to complete the languages selection table
+  function processLanguages() {
+    if (!tts.languages && tts.voices) {
+      tts.languages = tts.voices.map(function(m) {
+        return m.language;
+      });
+    }
+    if (tts.languages) {
+      $('select#node-input-lang').empty();
+      var unique_langs = tts.languages.filter(onlyUnique);
+
+      unique_langs.forEach(function(l) {
+        var selectedText = '';
+        if (tts.language_selected === l) {
+          selectedText = 'selected="selected"';
+        }
+        $('select#node-input-lang')
+          .append('<option value='
+                        + '"' + l + '"'
+                        + selectedText
+                         + '>'
+                        + (tts.LANGUAGES[l] ? tts.LANGUAGES[l] : l)
+                        + '</option>');
+      });
+
+    }
+  }
+
+ // Populate the Voices selection field
+ function populateVoices() {
+   if (!tts.voicenames && tts.voices) {
+     tts.voicenames = tts.voices.map(function(m) {
+       //return m.name.split('_')[1];
+       return m.name;
+     });
+     var unique_voices = tts.voicenames.filter(onlyUnique);
+     tts.voicenames = unique_voices;
+   }
+   if (!tts.voicedata && tts.voicenames){
+     tts.voicedata = [];
+     tts.voicenames.forEach(function(a){
+       var element = {};
+       var bits = a.split('_');
+       element.full = a;
+       element.language = bits[0];
+       element.person = bits[1].replace('Voice','');;
+       tts.voicedata.push(element);
+     });
+   }
+
+   if (tts.voicedata) {
+     $('select#node-input-voice').empty();
+
+     tts.voicedata.forEach(function(b) {
+       var selectedText = '';
+       if (tts.voice_selected === b.full) {
+         selectedText = 'selected="selected"';
+       }
+       if (tts.language_selected === b.language) {
+         $('select#node-input-voice')
+           .append('<option value='
+                         + '"' + b.full + '"'
+                         + selectedText
+                         + '>'
+                         + b.person
+                         + '</option>');
+       }
+     });
+   }
+ }
+
+
+  // Called to work through the voices, completing the dyanmic selection fields.
+  function processVoices() {
+    if (tts.voices) {
+      processLanguages();
+      populateVoices();
+    }
+  }
+
+  function visibilityCheck()
+  {
+    if (tts.voices) {
+      $('label#node-label-message').parent().hide();
+      $('select#node-input-lang').parent().show();
+      $('select#node-input-voice').parent().show();
+    } else {
+      $('label#node-label-message').parent().hide();
+      $('select#node-input-lang').parent().hide();
+      $('select#node-input-voice').parent().hide();
+    }
+
+  }
+
+  // Function called when either when the voices have been retrieved, or
+  // on dialog load, if the voices has already been retrieved
+  function postVoiceCheck(){
+    processVoices();
+    visibilityCheck();
+  }
+
+  // Retrieve the available voices from the server, if data is returned, then
+  // can enable the dynamic selection fields.
+  function getVoices(){
+    var u = $('#node-input-username').val();
+    var p = $('#node-input-password').val();
+
+    $.getJSON('watson-text-to-speech/voices/', {un: u, pwd: p}).done(function (data) {
+      if (data.error) {
+        $('label#node-label-message').parent().show();
+        $('label#node-label-message').text(data.error);
+      } else if (data.voices) {
+        tts.voices = data.voices;
+        postVoiceCheck();
+      }
+    }).fail(function (err) {
+      $('label#node-label-message').parent().show();
+      $('label#node-label-message').text('Error trying to determine available service voices');
+
+    }).always(function () {});
+  }
+
+
+  // The dynamic nature of the selection fields in this node has caused problems.
+  // Whenever there is a fetch for the models, on a page refresh or applicaiton
+  // restart, the settings for the dynamic fields are lost.
+  // So hidden (text) fields are being used to squirrel away the values, so that
+  // they can be restored.
+  function restoreFromHidden() {
+    tts.language_selected = $('#node-input-langhidden').val();
+    $('select#node-input-lang').val(tts.language_selected);
+
+    tts.voice_selected = $('#node-input-voicehidden').val();
+    $('select#node-input-voice').val(tts.voice_selected);
+  }
+
+  // Simple check that is only invoked if the service is not bound into bluemix. In this case the
+  // user has to provide credentials. Once there are credentials, then the tts.voices are retrieved.
+  function checkCredentials() {
+    var u = $('#node-input-username').val();
+    var p = $('#node-input-password').val();
+
+    if (u && u.length && p) {
+      if (!tts.voices) {
+        getVoices();
+      }
+    }
+  }
+
+  // Language Setting has changed, modofy voice options appropriately
+  function checkLanguage(){
+    //var lang = $('#node-input-lang').val();
+    //$('#node-input-voice option.' + lang).show();
+    //$('#node-input-voice option:not(.' + lang + ')').hide();
+    //var first = $('#node-input-voice option.' + lang + ':first').val();
+    //$('#node-input-voice').val(first);
+
+    tts.language_selected = $('#node-input-lang').val();
+  }
+
+  // Voice Setting has changed, modofy voice options appropriately
+  function checkVoice(){
+    tts.voice_selected = $('#node-input-voice').val();
+  }
+
+
+  // Register the onchange handlers
+  function registerHandlers() {
+    $('#node-input-username').change(function(val){
+      checkCredentials();
+    });
+    $('#node-input-password').change(function(val){
+      checkCredentials();
+    });
+    $('#node-input-lang').change(function () {
+      checkLanguage();
+      populateVoices();
+    });
+    $('#node-input-voice').change(function () {
+      checkVoice();
+    });
+
+  }
+
+  // Function to be used at the start, as don't want to expose any fields, unless the models are
+  // available. The models can only be fetched if the credentials are available.
+  function hideEverything() {
+    if (!stt.models) {
+      $('label#node-label-message').parent().hide();
+      $('select#node-input-lang').parent().hide();
+      $('select#node-input-voice').parent().hide();
+    }
+  }
+
+  // This is the on edit prepare function, which will be invoked everytime the dialog
+  // is shown.
+  function oneditprepare() {
+    hideEverything();
+    restoreFromHidden();
+    registerHandlers();
+
+    $.getJSON('watson-text-to-speech/vcap/')
+     .done(function (service) {
+       restoreFromHidden();
+        $('.credentials').toggle(!service);
+        if (!tts.voices) {getVoices();}
+        else {postVoiceCheck();}
+      })
+    .fail(function () {
+      $('.credentials').show();
+    }).always(function () {
+      $('#credentials-check').hide();
+    })
+  }
+
+  // Save the values in the dyanmic lists to the hidden fields.
+  function oneditsave(){
+    $('#node-input-langhidden').val(tts.language_selected);
+    $('#node-input-voicehidden').val(tts.voice_selected);
+  }
+
     (function() {
         RED.nodes.registerType('watson-text-to-speech', {
             category: 'IBM Watson',
             defaults: {
                 name: {value: ""},
-                lang: {value: "english"},
-                voice: {value: "en-US_MichaelVoice"},
-                format: {value: "audio/wav"}
+                lang: {value: ""},
+                langhidden: {value: ""},
+                voice: {value: ""},
+                voicehidden: {value: ""},
+                format: {value: "audio/wav"},
+                password: {value: ''}
             },
             credentials: {
               username: {type:"text"},
-              password: {type:"password"}
+              // password: {type:"password"}   - // Taken out because, was not being restored on dialog open.
             },
             color: "rgb(140, 198, 63)",
             inputs: 1,
@@ -111,24 +346,8 @@
             labelStyle: function() {
                 return this.name ? "node_label_italic" : "";
             },
-            oneditprepare: function() {
-              $('#node-input-lang').change(function () {
-                var lang = $('#node-input-lang').val();
-                $('#node-input-voice option.' + lang).show();
-                $('#node-input-voice option:not(.' + lang + ')').hide();
-                var first = $('#node-input-voice option.' + lang + ':first').val();
-                $('#node-input-voice').val(first);
-              })
-              $.getJSON('watson-text-to-speech/vcap/')
-               .done(function (service) {
-                  $('.credentials').toggle(!service);
-                })
-              .fail(function () {
-                $('.credentials').show();
-              }).always(function () {
-                $('#credentials-check').hide();
-              })
-            }
+            oneditsave: oneditsave,
+            oneditprepare: oneditprepare
         });
      })();
 </script>
diff --git a/services/text_to_speech/v1.js b/services/text_to_speech/v1.js
index 2fdc0503..7ded73d0 100644
--- a/services/text_to_speech/v1.js
+++ b/services/text_to_speech/v1.js
@@ -16,20 +16,53 @@
 
 module.exports = function(RED) {
   var cfenv = require('cfenv');
+  var watson = require('watson-developer-cloud');
 
-  var username, password;
+  // Require the Cloud Foundry Module to pull credentials from bound service
+  // If they are found then the username and password will be stored in
+  // the variables sUsername and sPassword.
+  //
+  // This separation between sUsername and username is to allow
+  // the end user to modify the credentials when the service is not bound.
+  // Otherwise, once set credentials are never reset, resulting in a frustrated
+  // user who, when he errenously enters bad credentials, can't figure out why
+  // the edited ones are not being taken.
+
+  var username, password, sUsername, sPassword;
 
   var service = cfenv.getAppEnv().getServiceCreds(/text to speech/i)
 
   if (service) {
-    username = service.username;
-    password = service.password;
+    sUsername = service.username;
+    sPassword = service.password;
   }
 
+  // Node RED Admin - fetch and set vcap services
   RED.httpAdmin.get('/watson-text-to-speech/vcap', function(req, res) {
     res.json(service ? {bound_service: true} : null);
   });
 
+  // API used by widget to fetch available models
+  RED.httpAdmin.get('/watson-text-to-speech/voices', function (req, res) {
+    var tts = watson.text_to_speech({
+      username: sUsername ? sUsername : req.query.un,
+      password: sPassword ? sPassword : req.query.pwd,
+      version: 'v1',
+      url: 'https://stream.watsonplatform.net/text-to-speech/api'
+    });
+
+    tts.voices({}, function(err, voices){
+      if (err) {
+        if (!err.error) {
+          err.error = 'Error ' + err.code + ' in fetching voices';
+        }
+        res.json(err);
+      } else {
+        res.json(voices);
+      }
+    });
+  });
+
   function Node(config) {
     RED.nodes.createNode(this, config);
     var node = this;
@@ -41,8 +74,8 @@ module.exports = function(RED) {
         return;
       }
 
-      username = username || this.credentials.username;
-      password = password || this.credentials.password;
+      username = sUsername || this.credentials.username;
+      password = sPassword || this.credentials.password || config.password; 
 
       if (!username || !password) {
         var message = 'Missing Speech To Text service credentials';
@@ -50,8 +83,6 @@ module.exports = function(RED) {
         return;
       }
 
-      var watson = require('watson-developer-cloud');
-
       var text_to_speech = watson.text_to_speech({
         username: username,
         password: password,