Update app.py

app.py

@@ -80,9 +80,18 @@ def render_midi(input_midi, render_options):
     print('=' * 70)
     print('Processing...Please wait...')
 
-    if render_options == ["Render as-is"] or not render_options:
+    if not render_options:
         output_score = escore
 
+    elif "Render as-is" in render_options:
+        output_score = escore
+
+    elif "Extract melody" in render_options:
+        output_score = [c[0] for c in cscore if c[0][3] != 9]
+        for e in output_score:
+            e[3] = 0
+            e[6] = 40
+        
     print('Done processing!')
     print('=' * 70)
     
@@ -115,6 +124,8 @@ def render_midi(input_midi, render_options):
                         patches[patches.index(-1)] = e[6]
                     else:
                         patches[-1] = e[6]
+
+    patches = [p if p != -1 else 0 for p in patches]
                 
     detailed_stats = TMIDIX.Tegridy_ms_SONG_to_MIDI_Converter(output_score,
                                                               output_signature = 'Advanced MIDI Renderer',