little tweaks

[Andrzej Kopeć]

I need to put a note with changed note head on a higher pitch without 
ledger lines. I want to obtain "the highest possibile pitch" note, which 
is usually a note with arrow-shaped note head.

This is my (partial) solution to this problem:

\version "2.4.2"
%...
        \once \override LedgerLineSpanner #'print-function = ##f  %no 
effect
        \once \override NoteHead #'print-function = 
#brew-new-markup-stencil
        \once \override Stem #'lengths = #'(4.0 4.0 4.0 5.0 5.5)
        \once \override NoteHead #'text = #(markup*
                                            #:translate (cons -0.5 
0.3)  %horizontal translation doesn't work
                                            #:fontsize 2
                                            #:musicglyph "solfa-2do")
b''4
%...

Is there any possibility to suppress printing ledger lines for only one 
note in one measure
(maybe problem is in fact,that Ledger_line_engraver is inside Staff 
context, and simple making it transparent or changing printing function 
to null doesn't work),
and how to move horizontally noteheads (in such circumstances)?

Andrzej