Update app.py

app.py

@@ -74,6 +74,7 @@ def normalize_phoneme_string(s: str) -> str:
         'ɚ': 'ɝ',    # R-colored schwa → r-colored vowel (both "er" sounds)
         'ʌ': 'ə',    # Open-mid back → schwa (both unstressed "uh" sounds)
         'ð': 'θ',    # Voiced th → voiceless th (accent training - treat as equivalent)
+        'ɹ': 'r',    # Retroflex approximant → regular r (espeak vs CMUdict difference)
     }
     
     for ascii_char, ipa_char in ascii_to_ipa.items():