On Fri, 2021-04-30 at 12:15 +0200, David Kastrup wrote:
> David Sumbler <da...@aeolia.co.uk> writes:
> > In a \relative{ } passage, in order for Lilypond to work out
> > theabsolute pitch of a note, it must have a record of the absolute
> > pitchof the previous note, even if there have been some intervening
> > rests. It seems probable that it has this information in all cases,
> > whetherrelative pitch notation is being used or not.
>
> No. \relative is a purely transformative function that takes music
> asinput and produces music (with a wrapping container of
> typeRelativeOctaveMusic that prevents further applications of
> \relative fromhaving an effect).
> This happens immediately as a transform when \relative is
> beingexecuted.
> > How can I access the pitch value of this most recent note for use
> > in aScheme function after some rests?
>
> Other value-propating mechanisms exist for default durations
> (attachedby the parser upon reading expressions), pitch-less
> durations (addedduring the scorifying stage when a music expression
> is accepted into a\score block), chord repeats (also at
> scorification).
> "For use in a Scheme function" is too hand-waving to have an idea
> whichphase of LilyPond's interpretation you would want to be
> interferingwith, so it would probably make more sense to present the
> problem youare trying to solve rather than guess about the tools you
> think LilyPondmust be using internally.
I want to be able to insert a note of the same pitch as the preceding
one. I don't mind what form the pitch information is in, so long as I
can use it to create a new note. It could, for example, be in the form
"b,,", or something similar to "(-2, 6)" as used by ly:make-pitch.
There may be other possibilities.
David
