Hi avitus, thanks for reporting this. In my testing C7 chords work correctly in the plugin, but G-7 chords cannot be entered. I plan to fix that in an upcoming update. In the meantime, you can enter Gm7, which is equivalent. The chord F/\7 isn’t a valid chord in either the main program or the plugin, so it should not be recognized at all. To help me understand exactly what you’re seeing, could you share the song file (SGU or MGU) if it’s available? That would allow me to replicate the behavior and investigate further.