Thanks for adding Flat Keys as the Circle of Fifths preference! I work more in Flat Keys than Sharp Keys and find this very helpful. I think all levels of users will derive great benefit from this small but important musical detail. It adds more professional polish to the program. Well done.
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it is right, but in harmony studies, in C, Gb is a fifth dim, we are in Db and F# is a fourth aug, we are in G
Cours d'harmonie - 2.8.1 - Enchaînements avec septièmes de dominante - YouTube]