Re: Calculating Tempi for midi output

[Mats Bengtsson]

The feature is already available! Example:

\version "2.10.0"
#(define base-tempo 100)
\score{
\relative c'{
\set Score.tempoWholesPerMinute = #(ly:make-moment base-tempo 4)
 c d e f
\set Score.tempoWholesPerMinute = #(ly:make-moment (/ (* base-tempo 3) 4) 4)
 c d e f
}
\midi{}
}

An extra advantage of this solution in this specific application is that it
doesn't result in new printed metronome marks.

  /Mats

Graham Percival wrote:
> Thanks, feature request added as
> http://code.google.com/p/lilypond/issues/detail?id=319
>
> Cheers,
> - Graham
>
> live action wrote:
> > I was wondering if the metronome number in a \tempo command could be 
> > a scheme number.  This would make it easier to do effects for fermata 
> > and ritards and relative tempo changes, in midi files.
> >
> > For example, it would be nice to be able to do something like this:
> >
> > ----------------
> > #(define base-tempo 100)
> >
> > \tempo 4 = #base-tempo
> >
> > % some music
> > % insert markup for "half note = dotted quarter" metronome mark
> > % and override so the following is invisible in the score
> >
> > \tempo 4 = #( / ( * base-tempo 3) 4)
> > ---------------
> >
> > This way, one could change the base tempo in one place, and all the 
> > tempi would adjust automatically.
> >
> > I'm guessing from the error messages I get when I try this, that  
> > this is a feature request, but it would be awesome to be able to do 
> > this.
> >
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--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================