articulation script vertically centered between staff lines.

[Karol Majewski]

Hi

In the following example, I want to change vartical position of the second 
staccato, so that it's ideally centered between 3rd and 4th staff line. I could 
override Y-offset or extra-offset, but then I have to know the right integer. 
Is there any general solution to this?


\version "2.19.3"

upper = {
  \clef treble \time 2/4
  \voiceOne a''8 \noBeam <b' d'' g''>8
}

lower = {
  \clef bass \time 2/4
  \override Beam.auto-knee-gap = ##f
  \voiceTwo b8 -. \change Staff = "upper" <d' e' g'>8 -.
}

\score {
  \new PianoStaff <<
    \new Staff = "upper" \upper
    \new Staff = "lower" \lower
  >>
}

Karol

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