Re: Current octave in relative mode

[antlists]

On 15/05/2020 12:28, antlists wrote:
> There's a function Han Wen wrote for me years ago, that's made its way 
> in to standard lilypond. It's probably mentioned in the docu about 
> relative mode. Something along the lines of
>
>        c1  \highlight { c8 d e f g f e d }
>        \setAbsoluteOctave ...
>        c1  \highlight { c8 d e f g a b c }
>
> Don't quote me on the function name though ... (I needed it for 
> Pennsylvania 6-5-0-0-0

Found it ...

\version "2.8.2"

resetOctave  =
#(define-music-function
    (parser location reference-note)
    (ly:music?)

   (let*
    ((notes (ly:music-property reference-note 'elements))
     (pitch (ly:music-property (car notes) 'pitch))

   )

    (set! (ly:music-property reference-note 'elements) '())
    (set! (ly:music-property reference-note
       'to-relative-callback)
       (lambda (music last-pitch)
        pitch))

    reference-note
    ))

pennsylvania = \context Voice = pennsylvania {
    \override NoteHead #'style = #'cross
    r2_\markup{ shout } f8. f16 f8. f16 f4 f f8. f16 r4
}

pennsylvaniaLyrics = \lyricmode { \small { Penn syl van ia six five thou 
sand } }

voiceTromboneI = \relative c' {

        r2  ef4.-- ef8-> ~ ef1 r2 r4 bf8.->( ef16-.) r2 r4 ef,8. af,16-> ~ |
        af2 c-- df-- d-- ef-- df-- c-- bf-- |
	\repeat "volta" 2 { R1*6 } \alternative { { \resetOctave f 
\pennsylvania } { \pennsylvania } }
	bf8-. cf4-> bf8-> ~ bf4 bf8.-- af16-. r8 af4.---. r2 bf8-. cf4-- bf8-> 
~ bf4 bf8.-- af16-> ~ |

> Cheers,
> Wol
Okay, this is just the start of the file so it won't compile as is :-) 
but you can see it defines the function resetOctave. I don't 
particularly remember how it works, but you also see how it's used 
further down. iirc it eats the first note after it - the f - and treats 
it as an absolute pitch of zero length so the subsequent phrase is at 
the right pitch regardless of what went in front of it.

As I say, I think this function or something similar has made its way 
into lilypond proper.

Cheers,
Wol

> On 15/05/2020 11:01, Klaus Blum wrote:
> > Hi,
> >
> > I have a function that uses a music expression twice.
> > My problem is:
> > In relative mode, this expression can lead into a different octave. Then
> > the second application of the music expression starts from that new 
> > octave.
> > (See the last two invocations of "\highlight" in the example below)
> >
> > Is there something I can do INSIDE my function to prevent this? E.g.
> > storing and re-applying the current octave? Thanks for any hint.  :)
I think you can use this inside your function. I explicitly didn't want 
to because this phrase appears in at least two different octaves so I 
wanted to apply the pitch outside it instead.

Cheers,
Wol