Oops my fault.
So here it goes:

\version "2.19.35"

\relative c'' {
  \set Score.proportionalNotationDuration = #(ly:make-moment 1/40)
  \override Beam.grow-direction = #RIGHT
  \featherDurations #(ly:make-moment 2/3)
  { e32[
    \override NoteHead.transparent = ##t
    e e e e e e e e e e e e e e]
  }

  \override Beam.grow-direction = #LEFT
  \featherDurations #(ly:make-moment 3/2) %% <= !!!
  { e32[ e e e e e e e e e e e
    \revert NoteHead.transparent
    e]
  }
  \override Beam.grow-direction = #'()
  s8
}

Cheers,
Pierre

2016-01-26 22:10 GMT+01:00 Pierre Perol-Schneider <
pierre.schneider.pa...@gmail.com>:

> Hi Caio, Hi Malte,
>
> Well there's something strange here: proportional duration seems to work
> in one feather direction only:
>
> \version "2.19.35"
>
> \relative c'' {
>   \set Score.proportionalNotationDuration = #(ly:make-moment 1/40)
>   \override Beam.grow-direction = #RIGHT
>   \featherDurations #(ly:make-moment 2/3)
>   { e32[
>     \override NoteHead.transparent = ##t
>     e e e e e e e e e e e e e e]
>   }
>
>   %%%% 'proportionalNotationDuration' has no effect here (bug?):
>   \override Beam.grow-direction = #LEFT
>   { e32[ e e e e e e e e e e e
>     \revert NoteHead.transparent
>     e]
>   }
>   \override Beam.grow-direction = #'()
>   s8
> }
>
> Any idea why ?
>
> Cheers,
> Pierre
>
> 2016-01-26 21:48 GMT+01:00 Malte Meyn <lilyp...@maltemeyn.de>:
>
>>
>>
>> Am 26.01.2016 um 21:19 schrieb Caio Giovaneti de Barros::
>> >
>> >
>> http://www.music.indiana.edu/departments/academic/composition/style-guide/images/newimages/featherEX.gif
>> >
>> >
>> > What do you think would be the best way to implement this in Lilypond?
>> >
>> This is already implemented; see section 1.2.4 of the notation reference
>> (this is called “feathered beams”).
>>
>> _______________________________________________
>> lilypond-user mailing list
>> lilypond-user@gnu.org
>> https://lists.gnu.org/mailman/listinfo/lilypond-user
>>
>
>
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