I’ve just discovered, that I can define a color for objects like trill lines, triplet brackets, bar lines in the properties panel, but the objects won’t change the color???
I just checked and you’re right. Some objects’ color property seems to work (8va and noteheads, for example) but I didn’t see a change when I tried changing the color of a trill either.
It’s either a bug, or they just haven’t hooked it up yet.
It would be useful to alter the default color of the voices. Some of the current defaults are difficult to discern (at least for me).
Some objects do respond to the Color property, but some do not. We will get around to making all of them respect that property in due course, I’m sure.