4 Arpeggios are supported, both cross-staff and broken single staff.
12 \context Staff=one \notes\relative c''{
13 \context Voice << fis, d a >>-\arpeggio
14 \property Staff.Arpeggio \override #'arpeggio-direction = #1
15 \context Voice << fis, d a >>-\arpeggio
16 %%\property PianoStaff.SpanArpeggio \override #'connect = ##t
17 \property PianoStaff.connectArpeggios = ##t
18 <<fis, a c>>-\arpeggio
20 \context Staff=two \notes\relative c{
22 \context Voice << g b d >>-\arpeggio
23 \property Staff.Arpeggio \override #'arpeggio-direction = #-1
24 \context Voice << g b d >>-\arpeggio