Update app.py

app.py

@@ -125,22 +125,23 @@ def render_midi(input_midi, render_type, soundfont_bank, render_sample_rate, cus
 
         for c in cscore:
             tones_chord = sorted(set([t[4] % 12 for t in c if t[3] != 9]))
+            notes_events = [t for t in c if t[3] != 9]
             drums_events = [t for t in c if t[3] == 9]
 
             if tones_chord:
                 
                 new_tones_chord = TMIDIX.check_and_fix_tones_chord(tones_chord)
                 
-                if len(c) > 1:
-                    output_score.extend([c[0]])
-                    for cc in c[1:]:
+                if len(notes_events) > 1:
+                    output_score.extend([notes_events[0]])
+                    for cc in notes_events[1:]:
                         if cc[3] != 9:
                             if (cc[4] % 12) in new_tones_chord:
                                 output_score.extend([cc])
                     output_score.extend(drums_events)
                 else:
                     
-                    output_score.extend([c[0]])
+                    output_score.extend([notes_events[0]])
             else:
                 output_score.extend(c)