unalign candanza like multimeasure improvisation

[tiM Sportny]

Dear List,

I'm trying to write down improvisation clues that have to be played within a 
few measures. Since these are just clues/suggestions there is no need to align 
the notes with other staves, i.e. I don't want it to be aligned.

In the example below, the only thing LP should care about is that the total 
size of the upper measures matches the total size of the "improvisation 
measure" below it. It shouldn't care about which note comes first, since the 
one playing the solo, shouldn't care about it either. (of course this is just a 
silly simplified example).

Has anyone had any experience with this? I've tried a lot of things, but it 
only seemed to get worse and worse.

Best Regards,

Tim


\version "2.12.0"

improv = { \relative c''{ \scaleDurations #'( 16 . 17 ){ b8[ des b deses b des 
b deses b deses b] ases4 \glissando ases' \glissando a, }}}

\score {
    \new StaffGroup <<
        \new Staff {
            \repeat unfold 8 b8 
            \repeat unfold 8 b8 
            \repeat unfold 8 b8 
            \repeat unfold 8 b8
        }
        \new Staff {
            R1
            \cadenzaOn
             \improv 
            \cadenzaOff
            \bar "|"
            R1
        }
   >>
    
    
    \layout {
        \context {
        \Score
        \remove "Timing_translator"
        \remove "Default_bar_line_engraver"
        \remove "Bar_number_engraver"
        
        }
        \context {
        \Staff
        \consists "Timing_translator"
        \consists "Default_bar_line_engraver"
        }
    }
}
                                          
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