Update app.py

app.py

@@ -145,7 +145,7 @@ def GenerateDrums(input_midi, input_num_tokens):
           if o > 127:
             x = torch.cat((x, out), 1)
         
-        x_output = x.tolist()[0]
+        x_output = x.tolist()[0][len(output):]
         
         output.extend(x_output)