GREAT               ECHO
    8 Open Diapason     8 Open Diapason
    8 Stop Diapason     8 Stop Diapason
    4 Principal         8 Trumpet
    4 Flute
2-2/3 Twelfth
    2 Fifteenth
1-3/5 Tierce Bass
1-3/5 Tierce Treble

C, D-d3 (50 notes)      c1-d3 (27 notes)