Le 15/05/2021 à 19:49, Jenifer Tribe a écrit :
I want to include a change of midi tempo at various points in a score,
using something like
\setSpeed #2 #120
where
setSpeed =
#(define-music-function
(parser location scale speed)
(number? number? )
#{
\set Score.tempoHideNote = ##t
\tempo scale = speed
#}
)
I'm still using 2.18 I'm afraid, which still used the parser and
location parameters..
I'm assuming this should be a music function rather than markup, but
perhaps my arguments aren't numbers.
In this case the function is hardly worth it, but I want to base more
complicated routines on it, and have failed at the first hurdle!
There are two mistakes here:
- In the function, scale and speed are interpreted as strings.
You want $scale and $speed (the reason for using $ instead
of # is explained in [1]).
- The scale argument is a duration, not a number (you can do
\tempo 4. = 120 for instance).
Corrected version:
\version "2.23.3"
setSpeed =
#(define-music-function
(parser location scale speed)
(ly:duration? number?)
#{
\set Score.tempoHideNote = ##t
\tempo $scale = $speed
#})
\score {
{
\setSpeed 4. 4
c
}
\layout { }
\midi { }
}
There is also the possibility of doing
\layout {
\context {
\Score
tempoHideNote = ##t
}
}
to set tempoHideNote globally (read [2]), and then you
can just use the normal \tempo command in the music.
Best,
Jean
[1]
https://extending-lilypond.readthedocs.io/en/latest/lily-and-scheme.html#hash-vs-dollar
[2]
http://lilypond.org/doc/v2.22/Documentation/notation/changing-context-default-settings
