Chords validity

When you place chords on a staff, they apply for all staves (which is musically logical). The symbol displays on the selected staff, but the chords apply to all staves. So, after having placed all the chords on the first staff, you can make them appear on every staff you want. Just select a staff and choose the "Edit" menu , "Chords..." and "Place the chords symbols" item. When you erase a chord on one staff, the rule is that if this chord appears in another staff, the symbol is erased but the chord is still there. When you erase a chord symbol which appears in one staff only, the chord is really erased.