\version "1.3.146"



% followVoice: connect note heads with line when thread switches staff 

\score{
    \context PianoStaff <
        \context Staff=one \notes\relative c''{
	    \context Thread
            a1 \break
	    \translator Staff=two
	    a,

	}
	\context Staff=two { \clef bass \skip 1*2 }
    >
    \paper{
        linewidth = 70.\mm
	\translator {
	    \ScoreContext
	    followVoice = ##t
	}
    }
}
