Uneven note spacing

[Andrew Bernard]

Greetings List,

In the following example from a piece I am setting, the composer wants the notes in the tuplets exactly evenly spaced, but I see considerable unevenness here. There are two questions. First, is this really the classical and canonical way to space tuplet notes when in the cross staff situation here? Secondly, even if it is, how can I make them evenly spaced out?

If I use proportional notation, the only way to spread them out evenly is to use such a large value that the score becomes ridiculously widely spaced.

The dodecaphonic accidental style is required in this piece.

Any help appreciated!

Andrew

====

\version "2.17.21"


\paper {
  ragged-right = ##t
}

% move to upper staff, stems down
upsd = #(define-music-function (parser location) ()
          #{
            \change Staff = upper
            \stemDown
          #}
          )

% move to lower staff, stems up
downsu = #(define-music-function (parser location) ()
            #{
              \change Staff = lower
              \stemUp
            #}
            )


upper = \relative c'' {
  \clef bass
  \time 1/4

  s4 s4 s4 s4 s4 s4
}

lower = \relative c {
  \clef bass
  \time 1/4

  \override TupletBracket.bracket-visibility = ##t
  \tupletDown
 
    \tuplet 7/8 {
    r16. a32^.[
    \once \override Stem.beaming = #(cons (list 0 1 2) (list 1 2)) \upsd g'_.
    \once \override Stem.beaming = #(cons (list 0 1) (list -1 0 1)) f_.
    \downsu bes,^.]
  }

  \stemUp
  \tuplet 7/8 {
    ces32[ \upsd ces ces \downsu ces \upsd ces \upsd ces \downsu ces]
  }

  c4 c4 c4 c4
}

\score {

  <<
    \new Staff = "upper" { \upper }
    \new Staff = "lower" { \lower }
  >>
  \layout {
    \context {
      \Score
      \accidentalStyle Score.dodecaphonic
    }
  }
}