match original pipeline's loop-doubling at max duration

app.py

@@ -228,6 +228,10 @@ def process_fn(description: str, min_length: float, max_length: float, seed: int
         )
     result = results[0].to(device="cpu", dtype=torch.float32)
 
+    max_duration = int(loopgen.duration * loopgen.frame_rate)
+    if valid_tokens[0] == max_duration:
+        result = torch.cat([result, result], -1)
+
     return _write_temp_wav(result, loopgen.sample_rate)