\relative c' { << { \dynamicUp r2 r16 c'8.\pp r4 } \\ { \override DynamicLineSpanner.layer = #0 des,2\mf\< ~ \override TextScript.layer = #2 \once\override TextScript.staff-padding = #6 \once\override TextScript.vertical-skylines = #'() des16_\markup \with-dimensions #'(2 . 7) #'(0 . 0) \with-color #white \filled-box #'(2 . 7) #'(0 . 2) #0 r8. des4 ~ des16->\sff r8. } >> }