Windows 7, Finale 26, GPO5
(I think this is a Finale question, but I also will post it in the Garritan forum)
The default for harp playback is a rolled chord.
However there is a common harp technique known as (in English) "flat chords" or "play flat", and (in French) "un accord plaqué" (notice the diacritical)
The notation is with a bracket, but how does one change the playback at any given instance in a piece from the default roll, to not rolled--such as how a pianist would typically play a chord?