ess-linear md-mode="determinate" class="md-accent" value="{{microphoneLevel}}" flex="95"></md-progress-linear>

                <div flex="95"> </div>

                <Audio id="sourceAudio"></Audio>
                <Audio id="outputAudio"></Audio>

            </md-whiteframe>

            <md-button id="sourceButton"
                       class="md-raised md-primary md-hue-1"
                       ng-if="microphoneSourceAudioEnabled"
                       ng-disabled="!microphoneSourceAudioReady"
    