cross-staff voice indication

[Florian Hollerweger]

Hi list,

I am looking for a possibility to print glissando-like lines between 
consecutive notes in different voices, which are potentially located in 
different staves.

This is often done in polyphonic piano music to indicate a change of 
staff in a particular part of a fugue. (In German we call these 
"Stimmweiser". I am not sure whether "voice pointers" would be the 
appropriate translation - any ideas?)

Do I have to misuse \glissando a la

  e2 \glissando f
  \once \override Glissando #'(bound-details right Y) = #-2
  e2 \glissando f

or

\override Glissando #'breakable = ##t
\override Glissando #'(bound-details right-broken Y) = #-3
c1 \glissando \break
f1

or is there a better solution?

Your suggestions are as always highly appreciated.

best,
flo.H