Voices and Edition Engraver

[tyronicus]

Fellow Ponders,

I'm trying to use the Edition Engraver for the first time. In the (smallish)
example below, see how in the current method that I use of splitting and
joining voices, the Ed.Engr. seems to be confused about when the voice
starts,
and thus, I'm unable to modify the slur in \voiceTwo.

I get the following error in the log:

warning: missing @ 1 #<Mom 0> Voice/B
warning: ---> \override NoteHead #'color = (0.0 0.0 1.0)
warning: ---> \override Slur #'color = (1.0 0.0 0.0)

Any tips on how I could do this? Do I need to change the way I handle
Voices?

%%%%%%%%%%%%%%%%%%%%%%

\version "2.19.37"

twoVoices = #(define-music-function (one two)(ly:music? ly:music?)
  #{ << { \voiceOne $one } \new Voice { \voiceTwo $two } >> \oneVoice #})

tenN = \relative c' {    \key b \minor    \clef "G_8"
  \twoVoices { b2.( cis4) } { fis,2( g4 b) }
   4   <fis b>2
}

\include "editorial-tools/edition-engraver/definitions.ily"

\layout {
  \context { \Voice
    \consists \editionEngraver ##f
  }
}

\score {
  \new Voice \tenN
}

\addEdition octavo
\editionMod octavo 1 0/4 Voice.A \override Slur.color = #green
\editionMod octavo 1 0/4 Voice.B \override NoteHead.color = #blue
\editionMod octavo 1 0/4 Voice.B \override Slur.color = #red

<http://lilypond.1069038.n5.nabble.com/file/n188450/slur-ex.png> 




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