- o -

• Off : ARDOUR , Gtkmm2ext
• off : MIDI
• OK : Gdk
• on : MIDI
• OPAQUE_STIPPLED : Gdk
• OpenFiles : PBD
• OR : Gdk
• OR_INVERT : Gdk
• OR_REVERSE : Gdk
• ORIENTATION_HORIZONTAL : Gtk
• ORIENTATION_VERTICAL : Gtk
• Overlap : ARDOUR
• OVERLAP_RECTANGLE_IN : Gdk
• OVERLAP_RECTANGLE_OUT : Gdk
• OVERLAP_RECTANGLE_PART : Gdk
• OverlapEnd : Temporal
• OverlapExternal : Temporal
• OverlapInternal : Temporal
• OverlapNone : Temporal
• OverlapStart : Temporal
• OWNER_CHANGE : Gdk