UPDATE

app.py

@@ -12,18 +12,18 @@ def process_audio(input_file,
     # Load the sound file
     sound = Fusion.loadSound(input_file)
     os.remove(os.path.abspath(input_file))
-    effect_str = []
+    effects_str = []
     
     # Apply effects based on user choices
     if effect_8d:
         sound = Fusion.effect8D(sound, pan_boundary, jump_percentage, time_l_to_r*1000, volume_multiplier)
-        effect_str.append("8d")
+        effects_str.append("8d")
     if effect_slowed:
         sound = Fusion.effectSlowed(sound, speed_multiplier)
-        effect_str.append("Slowed")
+        effects_str.append("Slowed")
     if effect_reverb:
         sound = Fusion.effectReverb(sound, room_size, damping, width, wet_level, dry_level, str(secrets.token_hex(5)))
-        effect_str.append("Reverb")
+        effects_str.append("Reverb")
 
     output_file = f"{input_file} {' + '.join(effects_str)} - {'By AudioFusion'}"