If anybody else needs this heres some first-aid to start with. It works in the special case below (with input from a 'SequentialMusic structure). It should use some lilypond-aware mapping-procedure finding all the 'EventChord's in the input and applying the filtering to these, leaving the rest intact. Maybe there is such a ly-map thing already?
\version "2.11.57"
filterChords = #(define-music-function (parser location music) (ly:music?)
"Return: { list of chords with only one note in each }."
(make-music 'SequentialMusic 'elements
(map (lambda (chord)
(make-music 'EventChord 'elements
(list (car (ly:music-property chord
'elements)))))
(ly:music-property music 'elements))))
music = { g16[ g < g a> g]}
\score {
<<
\new RhythmicStaff { \time 4/8 \relative c'' { \filterChords \music }}
\new Staff { \time 4/8 \relative c'' \music }
>>
}
And a nice picture:
<<attachment: tmp.png>>
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