Update app.py

app.py

@@ -14,7 +14,7 @@ separator = torch.hub.load('sigsep/open-unmix-pytorch', 'umxhq')
 def inference(audio):
     audio, rate = stempeg.read_stems(
         audio,
-        sample_rate=separator.sample_rate
+        sample_rate=44100
     )
     audio = torch.as_tensor(audio).float().T
     audio = audio[None]