Re: [feature request]: set grace note duration for MIDI playback

[James Lowe]

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On 10/06/15 21:21, Gilberto Agostinho wrote:
> Currently, the MIDI output from LilyPond uses a hard coded value to
> calculate the duration for the grace notes (1/4 of their duration
> according to the documentation or 9/40 according to David Kastrup).
> It would be really nice to allow the users to set this proportion
> themselves, since depending on the type of score one is engraving
> the grace notes can be either too fast or too slow, and the only
> solution right now is to manually create a different score with
> different values for the grace notes in order to produce a good
> MIDI file.
> 
> For the thread which originated this request, see: 
> http://lilypond.1069038.n5.nabble.com/grace-note-duration-td177682.html
>
>
> 
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> bug-lilypond mailing list address@hidden 
> https://lists.gnu.org/mailman/listinfo/bug-lilypond
> 
> 

Note that you can adjust the value directly (I believe - I am not a
programmer) in the ../ly/articulate.ly script itself although I assume
this would be global for the entire score.

As it states in the articulate.ly script file itself

- --snip--

% What proportion of an ordinary grace note's time should be stolen
% from preceding notes (as opposed to stealing from the principal note).
% Composers' intentions for this vary.  Taking all from the preceding
% notes is LilyPond's built-in behaviour for MIDI output.
#(define ac:defaultGraceBackwardness 1)

- --snip--

So unless you can set that #(define ...) each time, independently -
again I defer to my developer colleagues to suggest a way - you can at
least change the value from the 'default'.

James
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