Update audio processing state: next_index=39

processing_audio_state.json

@@ -39,6 +39,7 @@
     "audio/week05 16 pose reader doing the other side.wav": "processed",
     "audio/week05 15 pose reader on character creation.wav": "processed",
     "audio/week05 14 pose reader simple example creation.wav": "processing",
-    "audio/week05 13 pose reader simple example issue and solution.wav": "processed"
+    "audio/week05 13 pose reader simple example issue and solution.wav": "processed",
+    "audio/week05 12 rotation order.wav": "processing"
   }
 }