Hello there!
Fact 1: We have a nice solo defeat function and a graphic which states if the track defeats solo or not.
Fact 2: A track in solo defeat state can have
two states:
a) He plays normal (but the special status has to be reflected) because nothing is soloed.
b) He plays normal because he defeats the solo (but shouldn't look like a normal soloed track).
So we need actually two button graphics for a track in solo defeat state. One for normal state (like we have now) and one when solo is active.
I am currently thinking about the design of the solo defeat button but have trouble. A lock is kind of counter-intuitive (you still can press that button or not?). A permanent green lighting one can be misinterpreted as solo on state. A "D" instead of an "S" isn't signalling enough. Therefore this little request which - I know - isn't that important but I believe very quick doable.