Hi Gianmaria,

I know you can do this with GrandStaff and the score context settings shown
here.

Not sure how to do it with PianoStaff.

Andrew

%====
\version "2.19.82"
rh = { \clef treble \repeat unfold 3 {a1 b1 c'1 d'1 \break}}
lh = { \clef bass s1*4 a1 1 1 1}
\score
{
  \new GrandStaff <<
    \new Staff \rh
    \new Staff \lh
  >>
  \layout {

    \context {
      \Score
      \RemoveEmptyStaves
      \override VerticalAxisGroup.remove-first = ##t
    }
  }
}

%===


On Mon, 21 Jan 2019 at 21:13, Gianmaria Lari <gianmarial...@gmail.com>
wrote:

> The following code prints three "lines" of music. The first and second
> lines are two staff system (treble and bass) and the third line just one
> staff (treble).
>
> \version "2.19.82"
> rh = { \clef treble \repeat unfold 3 {a1 b1 c'1 d'1 \break}}
> lh = { \clef bass s1*4 a1 1 11}
> \score
> {
>   \new PianoStaff <<
>     \new Staff \rh
>     \new Staff \lh
>   >>
>   \layout {}
> }
>
> I would like to avoid printing the first bass line because it's empty
> (s1*4). How can I do it?
> Sorry for my "imprecise" english.
> g.
>
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