Re: LaissezVibrer tie on single note of chord

[Robin Bannister]

Nick Payne wrote:
> Is this possible without faking the chord by creating two voices?

Sometimes I like to show in my piano fingering that 
one finger of a chord should temporarily act as a pivot 
while the other fingers are moving to the the next chord. 
Maybe there is a recognised symbol for that, I don't know. 
Introducing a subsequent short note so that you can 
tie to it is overkill, and distracts the (sight-)reader. 

I had two problems with using laissezVibrer for this: 
- it applies to the whole chord 
- it affects the spacing. 

So I recently cooked up the following stencil override. 
The pseudo-tie is ignored by the spacing, which is what I wanted. 
But that probably won't suit you. 
And it's bigger; so it doesn't mix well with the real thing. 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% laissezVibrer using feta char overlay: dir: UP or DOWN (or pad per magnitude)      
#(define (flvSt dir) (lambda (grob)  
  (define dirsign   (if (positive? dir) + -) ) 
  (let* ((pos (ly:grob-property grob 'staff-position))
         (height (if (odd? pos) +0.8 +0.55)) (angle +90)) 
   (ly:stencil-combine-at-edge (ly:note-head::print grob) 0 1 
    (grob-interpret-markup grob (markup #:with-dimensions '(0 . 0) '(0 . 0)
              #:concat (#:hspace (abs dir) 
               #:raise (dirsign height)#:rotate (dirsign angle) 
              #:musicglyph "accidentals.rightparen" ))) 0 0 ))))
                
flvUP =   \once \override NoteHead #'stencil = #(flvSt UP) 
flvDOWN = \once \override NoteHead #'stencil = #(flvSt DOWN) 
%                          or \tweak #'stencil   ___ditto____  
flvUPtw =
#(define-music-function (parser location mus) (ly:music?)
 (set! (ly:music-property mus 'tweaks) (acons 'stencil 
 (flvSt UP)   (ly:music-property mus 'tweaks))) mus)
flvDOWNtw =
#(define-music-function (parser location mus) (ly:music?)
 (set! (ly:music-property mus 'tweaks) (acons 'stencil 
 (flvSt DOWN) (ly:music-property mus 'tweaks))) mus)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\relative c' {
   <a e'>\laissezVibrer s4
   <\flvDOWNtw a \flvUPtw e'> s4
   <a \flvUPtw e'> s4
   <\flvDOWNtw a e'> s4
}


Cheers,
Robin