Junction City, OH St. Patrick's R. C. Mathias Schwab, 1854 LEFT JAMB Open Diapason Bass Open Diapason Treble Viol d'Amour (treble) Stop. Diapason Treble Pedal (Note: Pedal couples Open Diapason Bass, Principal Bass, Stop. Diapason Bass, and Fifteenth if those stops are drawn) RIGHT JAMB Principal Bass (latches) Stop. Diapason Bass Dulciana (treble) Principal Treble (latches) Fifteenth (latches) Bass/Treble divide is between E2/F2.