Vertical Text alignment problem

[Wim van Dommelen]

Hi,

I have some problems with the vertical alignment of text. I tried both  
the \halign, \lower inside a \markup and explicit offset commands with  
an \override, but I couldn't get it right. This sample shows the  
problem in detail. I do want to move the two "gliss." text-strings  
nearly on top or directly below the glissando itself.

\version "2.14.1"

\score {
        \new Staff {
                \cadenzaOn
                \set Score.timing = ##f

                g'''4\ff\(
                <<
                {       \stemDown
                        f'''32[ s256 c'''32 s256 ces'''32 s256
                        \override NoteHead #'transparent = ##t
                        e''32 s256 d''32 s256 c''32 s256 a'32 s256 g'32 s256 
f'32 s256
                        \revert NoteHead #'transparent
                        d'32 s256 des'32 s256 c'32]
                        \stemNeutral
                } \\
                {       \override Glissando #'style = #'trill
                        \override NoteHead #'transparent = ##t
                        \override Stem #'transparent = ##t
                        \once \override Glissando #'extra-offset = #'(-0.5 . 
0.0)
                        \once \override TextScript #'extra-offset = #'(5.0 . 
-10.0)
			s16. g''4\glissando^\markup{ \rotate #-10 \italic \small "gliss." }  
g'8
                        \revert Glissando #'style
                        \revert NoteHead #'transparent
                        \revert Stem #'transparent
                }
                >>
                \times 2/3 { bes4-.\) d-^\> e-^ }
                \once \override Glissando #'style = #'trill
		e->\(\!\glissando_\markup{ \rotate #26 \halign #-2 \lower #-5  
\italic \small "gliss." } f'8[ g'--]\)
                \breathe
                \bar "|"
                a'8.[ a'16] ~ a'16[ g' f'( g'])
        }
}

It doesn't want to move as I intend to, it might be a problem wth the  
anchor, but I don't see it.

Any help is appreciated.

Regards,
Wim.