David Kastrup <d...@gnu.org> writes:
> Phil Holmes <m...@philholmes.net> writes:
>
>> Can anyone explain why the f in the attached code is 2 octaves above where
>> I would expect them?
>>
>> testy = #(define-music-function (note)
>> (ly:music?)
>> #{
>> \tag #'a { #note }
>> \tag #'b { #note }
>> #})
>>
>> \score {
>> \keepWithTag #'a {
>> \new Staff
>> {
>> \new Voice { \relative c'' { c d e \testy f } }
>> }
>> }
>> }
>
> Because you let it be shifted two times before selecting your tag? Your
> music does not contain two _copies_ of note, but rather contains note
> _itself_ two times. So \relative is applied to the same music two times
> in succession.
>
> Use #(music-clone note) or #(ly:music-deep-copy note) or $note for your
> two uses, and the note will get placed in two separate _copies_ of the
> original rather than using the note object itself in two places.
By the way: since \relative is applied before \keepWithTag, the result
will still likely suck when writing
\relative c'' { c d e \testy f, c }
since in first iteration it expands to
\relative c'' { c d e \tag #'a f, \tag #'b f, c }
namely
\absolute { c'' d'' e'' \tag #'a f' \tag #'b f c }
so the subsequent c is still likely to be one octave lower than
expected.
So you probably want
testy = #(define-music-function (note)
(ly:music?)
(make-relative (note) note
#{
\tag #'a { $note }
\tag #'b { $note }
#}))
This uses just "note" as the expression affecting \relative, but places
two separate copies of the once-affected note in your tags.
Expressed differently: the whole concept of \relative sucks.
--
David Kastrup
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