Update app.py

app.py

@@ -147,7 +147,7 @@ def GenerateDrums(input_midi, input_num_tokens):
         
         x_output = x.tolist()[0][len(notes_times):]
         
-        output.extend(x_output1)
+        output.extend(x_output)
 
     print('=' * 70)
     print('Done!')