3 In some cases, you may want to set slur attachments by hand.
9 \property Voice.Stem \set #'direction = #1
10 \property Voice.Slur \set #'direction = #1
12 \property Voice.Slur \set #'attachment = #'(stem . stem)
16 \paper { linewidth = -1.; }
19 \notes\relative c \fragment