4 Arpeggios are supported, both cross-staff and broken single staff.
12 \context Staff=one \notes\relative c''{
13 \context Voice < fis,-\arpeggio d a >
14 %%\property PianoStaff.SpanArpeggio \override #'connect = ##t
15 \property PianoStaff.connectArpeggios = ##t
18 \context Staff=two \notes\relative c{
20 \context Voice < g b d-\arpeggio >