I want to draw a multiphonic for cor anglais like pic (1). I’m using Legni Fonts. Unfortunately I’m not succesful; my best variant is like pic (2). 1.) How can I connect the lower note heads with arrows? Can I in Dorico only draw strictly vertical or horizontal arrows? - 2. How can I draw the lower note heads as circles with minus and plus symbols? Thanks!
You could create playing techniques for the + and -, then right-click->playing techniques->group playing techniques with them all selected. Finally move the middle one up in Engrave mode. For the lower noteheads you could use a Line attached to noteheads. See second picture.