Ambitus per voice and Ez_numbers_engraver

[Gloops]

Hello!
Ambitus by voice and Ez_numbers_engraver can not work together?
Gilles

#(define Ez_numbers_engraver
   (make-engraver
    (acknowledgers
     ((note-head-interface engraver grob source-engraver)
      (let* ((context (ly:translator-context engraver))
             (tonic-pitch (ly:context-property context 'tonic))
             (tonic-name (ly:pitch-notename tonic-pitch))
             (grob-pitch
              (ly:event-property (event-cause grob) 'pitch))
             (grob-name (ly:pitch-notename grob-pitch))
             (delta (modulo (- grob-name tonic-name) 7))
             (note-names
              (make-vector 7 (number->string (1+ delta)))))
        (ly:grob-set-property! grob 'note-names note-names))))))



\layout {
  ragged-right = ##t
  \context {
    \Voice
    \consists \Ez_numbers_engraver
    \consists "Ambitus_engraver"

  }
}



\new Staff <<
  \new Voice \with {
    
  } \relative c'' {
    \override Ambitus.X-offset = #2.0
    \voiceOne
    \easyHeadsOn
    c4 a d e
    f1
  }
  \new Voice \with {
    
  } \relative c' {
    \voiceTwo
    \easyHeadsOn
    es4 f g  as
    b1
  }
>>



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