I think you make a good point Pat two blended tones add a touch of class IMO. I think its also true that you 'can have too much of a good thing' and end up with a GUI that looks like a space ship or something - like Win Amp for example.

I have been thinking about the main screen, it could look SIbelius like - the creamy manuscript look. The main default font in the chord sheet window is comic sans I believe (I am away from BIAB at the moment) - this gives clarity but not elegance. Obviously this could be changed.
Loose that Windows Grey in all the dialogue boxes and the main screen - its like having grannies wallpaper in your living room. Also the font for the menus is a little old school.
Spin buttons: Like I say, I am not in front of my machine but do they show a slider once clicked? I recall they do not. My eyes are not great (judge by my tyupos) and it would be good if the smaller items on the screen were elegantly to enlarge on use.

Win 11 64, Asus Rog Strix z390 mobo, 64 gig RAM, 8700k