The Chord Symbols ruler lets you add chord symbols to Pro Tools sessions in the Edit window and in MIDI Editor windows. You can also add chord symbols and diagrams in the Score Editor (Chord Symbols and Diagrams).Chord symbols have no effect on MIDI data. Also, chord symbols are not included when exporting MIDI data from Pro Tools to a MIDI file, but they are included when exporting to a Sibelius file (.sib) or when using the Send to Sibelius command.