Update app.py

app.py

@@ -37,6 +37,8 @@ def binauralize(audio_file, simulate_rotation, rotation_speed, auto_rotation):
             # librosa expects float32 input.
             audio_float = audio.astype(np.float32)
             tempo, _ = librosa.beat.beat_track(y=audio_float, sr=sr)
+            # Cast tempo to float in case it's a NumPy array.
+            tempo = float(tempo)
             rotation_speed = tempo / 60.0  # Convert BPM to Hz (approx.)
             status_msg = f"Auto rotation enabled: Detected tempo = {tempo:.1f} BPM, setting rotation speed = {rotation_speed:.3f} Hz."
         except Exception as e: