glissando without starting note

[Mats Behre]

> Thanks Again James! But I'm sorry to tell you  that it doesn't work  :(
> 'cause having a previous note attached to the glissando, even if the note is
> hidden, make changes to the time in the bar.

If timing is the only problem you can use something akin to this fucntion I've 
been using to make things at least a little more readable in the main score:

preGliss = #(
   define-music-function (parser location glissMusic startPoint units) 
(ly:music? number? number?) #{
       \once \override NoteHead #'X-extent = #'(1 . 1)
       \hideNotes $glissMusic \unHideNotes
       \set Timing.measurePosition = #(ly:make-moment $startPoint $units)
   #}
)

Used e.g. like this:

           r8 \preGliss { g'4 \glissando } #1 #8
           d'4--\mf c8 bes f \triplet { \stemDown f,8 ees' f, \stemNeutral } \bar 
"||"

I have not found a way to avoid having the "\glissando" in the music.
What this does is to start the glissando at the g indicated in the music (I 
used to have g32, but in 2.12.3 that doesn't show a gliss, and for g8 the gliss 
is too short) and ends it at the following d. The #1 #8 means that the music 
after the gliss should start 1/8 into the bar.

If someone knows a way to improve on this function I'd be happy.

Rgds,
Mats