Re: beat divisions and compound meter

[Urs Liska]

Am 25. November 2017 12:13:30 MEZ schrieb "N. Andrew Walsh" <address@hidden>:
>Hi List,
>
>I have a file with the following functions defined:
>
>beambreakOn = {
>  \set subdivideBeams = ##t
>  \set baseMoment = #(ly:make-moment 1/8)
>  \set beatStructure = #'(2 2 2 2)
>}
>
>beambreakOff = {
>  \set subdivideBeams = ##f
>  \set baseMoment = #(ly:make-moment 1/8)
>  \set beatStructure = #'(2 2 2 2)
>}
>
>when invoked inside a music expression, they set all beams greater than
>the
>8th (that is, past the first) to break at the 8th note. This allows,
>for
>example, the following expression (pseudo-code):
>
>{ a32 b c d e f g16 }
>
>to split neatly at the midpoint, clarifying the metric structure. The
>problem is, later on in the piece I have the following command:
>
>\compoundMeter #'((3 4 16))
>
>and a measure with the contents (pseudo-code):
>
>{ < f a c >8 < d fis a >16 < f a c > < g b d >8\fermata < d fis a >16 }
>
>theoretically, this should automatically divide thus:
>
>{ < f a c >8[ < d fis a >16] < f a c >[ < g b d >8\fermata < d fis a
>>16] }
>
>but instead it divides:
>
>{ < f a c >8[ < d fis a >16 < f a c >] < g b d >8\fermata[ < d fis a
>>16] }
>
>Here's the whole thing in a MWE:
>
>---------------------------------
>\version "2.19.80"
>
>
>beambreakOn = {
>  \set subdivideBeams = ##t
>  \set baseMoment = #(ly:make-moment 1/8)
>  \set beatStructure = #'(2 2 2 2)
>}
>
>beambreakOff = {
>  \set subdivideBeams = ##f
>  \set baseMoment = #(ly:make-moment 1/8)
>  \set beatStructure = #'(2 2 2 2)
>}
>
>
>\relative c' {
>  \time 4/8
>
>  %1
>\beambreakOn a32\( b cis dis eis8\) a,32\( b cis dis eis16\)\fermata <
>a,
>cis e >32 < a cis e > \beambreakOff
>
>  | %2
>  \compoundMeter #'((4 3 16))
>  < f' a c >8 < d fis a >16 < f a c > < g b d >8\fermata < d fis a >16
>
>  | %3
>  \time 4/8
>\beambreakOn a32\( b cis dis eis8\) a,32\( b cis dis eis16\)\fermata <
>a,
>cis e >32 < a cis e > \beambreakOff
>}
>---------------------------------
>
>Is there a command I can insert after the first measure to allow the
>\compoundMeter command to reset beam divisions as intended?

Short answer: not yet. I have been working on an analysis of the whole matter 
but got interrupted by privare matters.
I'll at least provide a complete assessment of the matter but can't promise a 
solution.

Urs

>
>Cheers,
>
>A

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