I created biab song with a melody that contains many instances of vertical notes, that is, two notes that sound at the same time. When I created it, I could play the song and hear both vertical notes, and I could print the song and see both vertical notes. Now, some months later, I cannot print the vertical notes - when I print the song, I see a monphonic melody. I can still hear the vertical notes. I do not have 'mono' checked on the main screen. I can create new songs with vertical notes that I can print and hear. Does anyone know how I might fix the older song so I can again see the vertical notes? Thanks!