As an exercise in learning to write lilypond scheme extensions, I've been
trying to write a music-function that, given an EventChord or
SequentialMusic, will return the passage in octaves, so c would return <c
c,>. I've run into a problem, though.
When I run the following:
\version "2.10.20"
\relative c' {
\displayMusic <c' c,>
}
\relative c'' {
\displayMusic <c c,>
}
While the music it generates is the same, the scheme it generates is
different. In the first case, the scheme pitches generated are:
(ly:make-pitch 0 0 0)
(ly:make-pitch -2 0 0)
But in the second case, it returns:
(ly:make-pitch -1 0 0)
(ly:make-pitch -2 0 0)
But the music it generates is the same. This seems to conflict with the
docs for ly:make-pitch as I understand it: "octave is specified by an
integer, zero for the octave containing middle C." It seems to somehow
relate to the current relative pitch, not necessarily middle c. Unless I
don't understand how the doc is defining 'middle c'?
The problem I've hit is that, whenever I try to add the lower octave to the
EventChord, I don't know whether to subtract the octave of the pitch passed
in by 1 or 2 (or something else). I've also tried using ly:pitch-transpose,
but I wind up with the same result.
Is there some other way that I can find the absolute pitch of the note? Or
some other approach I can use?
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