Update app.py

app.py

@@ -248,20 +248,25 @@ def Mix_Melody(input_midi,
         #===============================================================================
 
         if input_output_as_solo_piano:
+            
             csong = TMIDIX.chordify_score([1000, mixed_song])
 
             mixed_song = []
 
             for c in csong:
-                pitches = []
+                
+                pitches = [e[4] for e in c if c[6] == trg_patch]
+                
                 for cc in c:
+                    
                     ccc = copy.deepcopy(cc)
+                    
                     if cc[3] != 9: 
                         if cc[6] == trg_patch:
                             ccc[3] = 3
                             ccc[6] = 0
                             mixed_song.append(ccc)
-                            pitches.append(cc[4])
+                            
                         else:
                             if cc[4] not in pitches:
                                 ccc[3] = 0
@@ -269,7 +274,6 @@ def Mix_Melody(input_midi,
                                 mixed_song.append(ccc)
                                 pitches.append(cc[4])
             
-
                     else:
                         mixed_song.append(ccc)