---
** [issues:#687] Enhancement: inequal MIDI quantization of equal durations
(swing, rubato)**
**Status:** Accepted
**Created:** Sat Sep 27, 2008 02:32 PM UTC by Anonymous
**Last Updated:** Fri Jan 10, 2014 11:46 AM UTC
**Owner:** nobody
*Originally created by:* *anonymous
*Originally created by:* [v.villenave](http://code.google.com/u/v.villenave/)
% In jazz or baroque music, equal values \(like eighth notes\) may be
% written equallly but are not to be played equally \(the "swing" thingy\).
% Peter Chubb said:
I think it's a bit hard to do in Scheme \(need to do look-ahead in the list
of chords\).
What I'd like to see is a general rubato function, that:
1. takes a parameter \(maybe call it \`swing'\) that lengthens on-beat
phrases, and shortens off-beat phrases by the same amount \(so convert
a8 b to \times 2/3 \{ a4 b8 \} or \{ a8 b16 c \} to \times 2/3 \{a4 b16 c\}
or similar\)
2. Within phrasing slurs does a slight accelerando into the phrase
and a slight decelerando to a-tempo at the end
% See also the discussion on
[http://lists.gnu.org/archive/html/lilypond-devel/2008-09/msg00197.html](http://lists.gnu.org/archive/html/lilypond-devel/2008-09/msg00197.html)
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