On 8 November 2017 at 18:15, David Kastrup <d...@gnu.org> wrote:
> Gianmaria Lari <gianmarial...@gmail.com> writes:
>
> > Talking about midi, is there any way to to reduce or increase the tempo
> of
> > some measures by a certain percentage instead of setting it to an
> absolute
> > value?
> >
> > For example instead of:
> >
> > \tempo 4=100 a b c d
> > \tempo 4=110 e f g a
> >
> >
> > something like
> >
> > \tempo 4=100 a b c d
> > \tempo 4=currentTempo*1.1 e f g a
> >
>
> Well, it's not pretty (but then one can try wrapping the prettiness into
> a music function), but here goes:
>
I tried to make it pretties. Here it is the code:
\version "2.19.80"
increaseTempo =
#(define-music-function (factor)(number?) #{
\context Timing \applyContext
#(lambda (c)
(set! (ly:context-property c 'tempoWholesPerMinute)
(ly:moment-mul (ly:context-property c 'tempoWholesPerMinute)
(ly:make-moment factor))))
#} )
\score {
{
\tempo 4=100
a b c' d'
\increaseTempo 3
e' f' g' a'
}
\midi {}
\layout {}
}
This works ok only when \increaseTempo argument is integer. If i try
\increaseTempo 2.5 it doesn't work. How to fix it?
Thank you, g.
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