Update app.py

app.py

@@ -110,10 +110,11 @@ def render_midi(input_midi, render_options):
             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]
+                if patches[e[3]] != e[6]:
+                    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',