Update app.py

app.py

@@ -103,9 +103,11 @@ def render_midi(input_midi, render_options):
     new_fn = fn1+'.mid'
 
     patches = [0] * 16
+    patches[9] = 9
+    
     channels = [0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15]
 
-    score_patches = sorted(set([e[6] for e in output_score]))
+    score_patches = sorted(set([e[6] for e in output_score if e[3] != 9]))
 
     for channel, patch in enumerate(channels[:len(score_patches)]):
         patches[patch] = score_patches[channel]