- \override Slur #'color = #(x11-color "violet")
- \override PhrasingSlur #'color = #(x11-color "violet")
- \override Stem #'transparent = ##t
- \override Flag #'transparent = ##t
- \override Stem #'length = #0
+ \override Slur.color = #(x11-color "violet")
+ \override PhrasingSlur.color = #(x11-color "violet")
+ \hide Stem
+ \override Stem.length = #0