4 In some cases, you may want to set slur attachments by hand.
10 \property Voice.Stem \set #'direction = #1
11 \property Voice.Slur \set #'direction = #1
13 \property Voice.Slur \set #'attachment = #'(stem . stem)
17 \paper { linewidth = -1.; }
20 \notes\relative c \fragment