Update audio processing state: next_index=60

processing_audio_state.json

@@ -60,6 +60,7 @@
     "audio/week04 11 reverse fk spine finish.wav": "failed",
     "audio/week04 10 reverse fk spine start.wav": "failed",
     "audio/week04 09 ik ribbon spine blend for volume preservation and clean up.wav": "failed",
-    "audio/week04 08 ik ribbon spine squash stretch color coding.wav": "failed"
+    "audio/week04 08 ik ribbon spine squash stretch color coding.wav": "failed",
+    "audio/week04 07 ik ribbon spine squash stretch with volume preservation.wav": "processing"
   }
 }