PIano: Partial Pedalling

[Dijkhuizen, J.F. van]

Dear All,

I've tinkered about some more with partial pedalling and gradual sustain pedal release, and here's some code (some of it copied/adapted from the internet) that seems to work, even though in some respects it shouldn't:

\version "2.20.0"

\relative c'' {
  \set Staff.pedalSustainStyle = #'bracket
 
  % 1. standard sustain pedal behaviour
  c1\sustainOn c \sustainOff \sustainOn c\sustainOff c
 
  % 2. gradual pedal release indicated by dashed line
   \once \override Staff.PianoPedalBracket.edge-height = #' (1 . 0)
  c1\sustainOn
  \once \override Staff.PianoPedalBracket.bracket-flare = #'(0 . 14.5)
  \once \override Staff.PianoPedalBracket.edge-height = #' (0 . 1)
  \once \override Staff.PianoPedalBracket.style = #'dashed-line
  c \sustainOff \sustainOn
   c c4\sustainOn \sustainOff c c c
   
     % 3. 1/2 pedal instruction
   \set Staff.pedalSustainStyle = #'mixed
    \once \override Staff.PianoPedalBracket.edge-height = #' (0 . 1)
   \override Staff.PianoPedalBracket.bracket-flare = #'(8 . 0)
   \once \override Staff.SustainPedal #'stencil =
  #(lambda (grob) (grob-interpret-markup grob (markup "½")))
   c1\sustainOn c c \sustainOff
}

In the second snippet, the slanted pedal release line ONLY works if \sustainOff in the final line is preceded by \sustainOn; otherwise the line remains horizontal.

It doesn't make complete sense to me, since there's already a \sustainOn in the preceding line. So this is probably isn't how it's supposed to be done, but for now it offers a simple way of notating gradual sustain pedal release.

Jan