Update app.py

app.py

@@ -102,16 +102,19 @@ def render_midi(input_midi, render_options):
     
     new_fn = fn1+'.mid'
 
-    patches = [0] * 16
+    patches = [-1] * 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 if e[3] != 9]))
-
-    for channel, patch in enumerate(channels[:len(score_patches)]):
-        patches[patch] = score_patches[channel]
-        
+    for e in output_score:
+        if e[3] != 9:
+            if patches[e[3]] == -1:
+                patches[e[3]] = e[6]
+            else:
+                if -1 in patches:
+                    patches[patches.index(-1)] = e[6]
+                else:
+                    patches[-1] = e[6]
+                
     detailed_stats = TMIDIX.Tegridy_ms_SONG_to_MIDI_Converter(output_score,
                                                               output_signature = 'Advanced MIDI Renderer',
                                                               output_file_name = fn1,