One important thing to remember too is that there are many ways to roll a chord and the variety adds interest to the piece. The opening chords of the Danses for example are almost(but not quite) flat. Chords in Pierne and Faure are much fuller and longer. Sometimes the top note(as in Renie’s Contemplation)has to be brought out slightly stronger, or the bottom note(as in the Danses). Sometimes a crescendo over the chord is needed (the final chord of Parish-Alvars Serenade comes to mind). There should never be just one way of rolling a chord.