Update app.py

app.py

@@ -42,7 +42,7 @@ def TranscribePianoAudio(input_file):
     print('Loading audio...')
     
     # Load audio
-    (audio, _) = load_audio(fn, sr=sample_rate, mono=True)
+    (audio, _) = load_audio(input_file, sr=sample_rate, mono=True)
     print('Done!')
     print('-' * 70)
     print('Loading transcriptor..')