Trill line playback always applies to voice 1
I'm not quite sure whether this would be called a bug report or a feature request; it feels like something unintended, but also something that can't be done with other line objects; a bit of both? Regardless, the problem is that trill lines from the line palette (and by extension wavy lines) apply their effects to a single voice in the measure. This is a problem in that you cannot actually set what voice the line modifies; it assumes voice 1 every time, and it takes no large effort to find an example that would contradict this. Sure, you could add a trill line, make it have no playback, then just add an invisible trill notation; but that's rather excessive considering that a trill line already functions for what we want it to do if it weren't for the voice restrictions.