Update audio processing state: next_index=167

processing_audio_state.json

@@ -162,6 +162,7 @@
     "audio/Week 4 - 4 DetailingtheHead.wav": "processed",
     "audio/Week 4 - 3 ModellingTechniques.wav": "processed",
     "audio/Week 4 - 2 NewHeadPieces.wav": "processed",
-    "audio/Week 4 - 1 Recap.wav": "processed"
+    "audio/Week 4 - 1 Recap.wav": "processed",
+    "audio/Week 4 - 0 Intro.wav": "processing"
   }
 }