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Re: Microrhythm

From: Torsten Hämmerle
Subject: Re: Microrhythm
Date: Sat, 19 May 2018 03:07:54 -0700 (MST)

Dave Tremblay wrote
> However, I wonder if it would be possible to make it play, or at least
> display, microrhythms, [...]

Hi Dave,MIDI playback of microrhythms (including interpolation between the
two notated extremes by applying time-dependent percentages) surely will not
be possible to achieve out-of-the-box.But, as a starting point, notating
microrhythms (and notation is the main purpose of LilyPond, for "realistic"
output one might be better off with a DAW software), there are several
possibilities.Just one approach:*Rhythmic spacing (!?)*When looking at the
examples specified, it is clearly visible that the quavers (eighth notes) in
the main stave are using a standard spacing and the stems (!) of the
rhythmic stave are at the exact same horizontal positions.Therefore, a
solution using an 11:14 tuplet will not work out, because the rhythmic stems
would be spaced in a rhythmically correct way and thus they will never
co-incide with the "ordinary" quavers.Remark: As soon as one of the main
stave stems has downward direction, it starts getting funny because, as I
can see it from the examples given, the stem positions of rhythmic and main
stave should match.*Rhythmic Stave*Therefore, I used scaled all the notes in
the rhythmic stave in a way that, technically, they all have a duration of
quavers in order to be graphically synchronized with the main stave
quavers.This can be done by writing a semiquaver (sixteenth note) and
multiplying its duration by 2 (i.e. 16*2) so that it looks like a semiquaver
but has the duration of a quaver.The 11 tuplet marking is obtained by simply
using a "fake" \tuplet 11/11 (because the actual durations of the rhythmic
stave will have to match the durations of the main stave in order to get the
positioning right, therefore me must not use a rhythmically correct 11:14
tuplet notation!).The note-heads of the rhythmic stave have been hidden (but
they take up space in order to get the correct beam positioning).Some
cosmetic tweaking to beam thicknesses, stem lengths etc.By setting the
basic-distance of VerticalAxisGroup.staff-staff-spacing to 0, rhythmic and
main stave move closely together.*Brackets for grouping*The brackets for
marking the groups of five resp. groups of four have been created by using
analysis brackets.*Upbeat*I didn't use a proper upbeat because in the lower
stave (not shown here), there is a full measure rest.I don't know whether
this is on purpose or the notation software (or the user) used couldn't deal
with it in a standard way.
%%%%%%%%%\version "2.19.81"\score {  <<    \new RhythmicStaff \with {     
\remove "Staff_symbol_engraver"      \remove "Time_signature_engraver"     
\hide NoteHead      \override Stem.length-fraction = 0.65      \override
Stem.thickness = #0.75      \override Beam.length-fraction = 0.65     
\override Beam.beam-thickness = 0.34      \override
VerticalAxisGroup.staff-staff-spacing.basic-distance = 0    }    {      s2.
s8 |      \repeat unfold 4 \tuplet 11/11 { 8[ 16*2 16*2 8 8 16*2 8] } |    }   
\new Staff \new Voice \with {      \consists "Horizontal_bracket_engraver"     
\override HorizontalBracket.bracket-flare = #'(0 . 0)    }    \relative {     
\key as \major      \time 7/8      \set Staff.beatStructure = 4,3     
\override HorizontalBracketText.text = "5"      s2. c'8\startGroup |     
\repeat volta 2 {        f bes es, as\stopGroup c,\startGroup f bes |       
es, as\stopGroup c,\startGroup f bes es, as\stopGroup |        c,\startGroup
f bes es, as\stopGroup        \override HorizontalBracketText.text = "4"       
bes,\startGroup f' |        bes f\stopGroup bes,\startGroup f' bes
f\stopGroup c |      }    }  >>}%%%%%%%%%HTH,Torsten

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