fallback for mic stream stop

app/pods/components/music-tab/component.js

@@ -95,7 +95,13 @@ export default Em.Component.extend(helperMixin, visualizerMixin, {
       this.changePlayerControl('audioMode', 0);
 
       if(!Em.isNone(audioStream)){
-        audioStream.stop();
+        var tracks = audioStream.getVideoTracks();
+        if (tracks && tracks[0] && tracks[0].stop) tracks[0].stop();
+
+        if (audioStream.stop) {
+          // deprecated, may be removed in future
+          audioStream.stop();
+        }
 
         this.setProperties({
           audioStream: null,

app/pods/components/music-tab/mixins/helpers.js

@@ -33,7 +33,7 @@ export default Em.Mixin.create({
         values: [0,20,40,60,80,100],
         density: 10,
         format: {
-          to: function ( value ) {return value;},
+          to: function ( value ) {return 'x'+value;},
           from: function ( value ) { return value; }
         }
       }

app/pods/components/music-tab/template.hbs

@@ -157,7 +157,6 @@
       <div class="beatOption col-xs-4">
           <span data-toggle="tooltip" data-placement="bottom auto" data-title="The coefficient to boost the microphone signal by" class="optionDescription bootstrapTooltip">Microphone Boost</span>
         {{range-slider start=micBoost orientation="vertical" step=beatOptions.micBoost.step range=beatOptions.micBoost.range slide="micBoostChanged" pips=beatOptions.micBoost.pips}}
-          <div class="text-center">{{micBoost}}</div>
       </div>
   {{/if}}