I guess you’re right, Daniel; they aren’t exactly equivalent to the wiggly arpeggiation lines (which mean specifically to play each note in succession). If we’re talking about literal symbols, it would be nice to have the baroque arpeggiation symbol as another option (the little slash through the upward or downward stem showing which direction the chord is rolled).
It just seems like I could get what I wanted if there were the option to straighten out the wiggly arpeggio lines… but yes, it’s not semantically quite right.
I do think string players think of this as “rolling the chord,” even in this 2+2 way. For example, modern-trained string players will play Bach’s quadruple-stop chords 2 notes + 2 notes, and historical performers will arpeggiate the chord note-by-note. Gould says this is “the convention” but I’d say it’s just one modern performance practice of arpeggios on string instruments.
Anyway, I guess one hope is that eventually we’ll have some magic line editor (like the Playing Techniques editor) where I could just create a new (second!) Arpeggio Line style and make it look however I wanted. I know someday my prince will come—I think that’s Daniel. Or is he our fairy godmother?
Thanks for the suggestions, fratveno and teacue. Teacue, those look perfect but unfortunately, I do need a million normal arpeggio lines in this opera (and in a different thread I’m still wishing for more detailed spacing controls around those) so I can’t just replace the wiggly line, but I can make a new playing technique and manually position it. It’s just whenever I start adjusting note spacing in a big piece, it’s asking for trouble later on. Even just switching from Galley view to Engrave mode in this gigantic opera score is deathly slow, so I’m trying to minimize Engrave mode work at the moment. Thank you, though, there’s clearly a way to make it work, manually!