diff --git a/src/agent_gsm.py b/src/agent_gsm.py
index e28655f..f92873f 100644
--- a/src/agent_gsm.py
+++ b/src/agent_gsm.py
@@ -152,7 +152,7 @@ def run_analyze(file_test: str, file_reference: str, number: str) -> bool:
             return False
         
         try:
-            bounds_signal : SignalBoundaries = None
+            bounds_signal = SignalBoundaries()
             if is_caller:
                 bounds_signal.offset_start = 10.0   # Skip ringtones
                 bounds_signal.offset_finish = 1.0   # Eat possible end tone
@@ -297,7 +297,7 @@ def perform_answerer():
             break
 
         # Call analyzer script
-        run_analyze(CONFIG.RecordFile, CONFIG.ReferenceAudio, '')
+        run_analyze(CONFIG.RecordFile, CONFIG.PreparedReferenceAudio, '')
         
         # Increase counter of attempts
         attempt_idx += 1