essentia is gone

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 <li>Classification of Separated Signals</li>
 </ol>
 
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-<h2 id="Appendix">Appendix<a class="anchor-link" href="#Appendix">&#194;&#182;</a></h2>
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-<li><a href="beat_tracking_essentia.html">Beat Tracking in Essentia</a> (<a href="beat_tracking_essentia.ipynb">ipynb</a>)</li>
-<li><a href="spectral_features_essentia.html">Spectral Features in Essentia</a> (<a href="spectral_features_essentia.ipynb">ipynb</a>)</li>
-<li><a href="feature_extraction_essentia.html">Feature Extraction in Essentia</a> (<a href="feature_extraction_essentia.ipynb">ipynb</a>)</li>
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index.ipynb

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     "1.  [Exercise: Source Separation using NMF](nmf_source_separation.html) ([ipynb](nmf_source_separation.ipynb))\n",
     "1.  Classification of Separated Signals\n"
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-   "source": [
-    "## Appendix"
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-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "1.  [Beat Tracking in Essentia](beat_tracking_essentia.html) ([ipynb](beat_tracking_essentia.ipynb))\n",
-    "1.  [Spectral Features in Essentia](spectral_features_essentia.html) ([ipynb](spectral_features_essentia.ipynb))\n",
-    "1.  [Feature Extraction in Essentia](feature_extraction_essentia.html) ([ipynb](feature_extraction_essentia.ipynb))"
-   ]
   }
  ],
  "metadata": {