The online documentation (version 2.16,
Notation Reference 1.3.3) gives this snippet.
...
1.Which
of these lines (discounting change of pitch and duration)
should be used?
2.Where
in an already started Piano score should they be inserted?
You already have a PianoStaff or GrandStaff context that contains
two Staff contexts. Right? The "PianoStaff.connectArpeggios"
setting applies to the whole staff. You just need that \set line
once. I would put at the beginning, with the \time signature and
the \key signature.
The \arpeggio command modifies the chord to which it was attached.
Any time you have a chord that needs to be arpeggiated, you add
\arpeggio after the end of the chord.
--
Tim Roberts, address@hidden
Providenza & Boekelheide, Inc.