1. IN A PIPE ORGAN, A WIND CHEST, A KEY CHANNEL, MEANS DEFINING A PORT FOR CONVEYING AIR FROM SAID WIND CHEST TO SAID KEY CHANNEL, A PALLET MOUNTED IN SAID WIND CHEST FOR CLOSING SAID PORT, MEANS BIASING SAID PALLET TO CLOSED POSITION, A PLURALITY OF INDIVIDUALLY OPERABLE MOTOR MEANS CONNECTED TO SAID PALLET FOR EFFECTING MOVEMENT OF SAID PALLET TO VARIOUS OPEN POSITIONS, A DEPRESSIBLE KEY, MEANS RESPONSIVE TO THE DEPRESSION OF SAID KEY FOR ACTUATING A PROGRESSIVELY LARGER NUMBER OF SAID MOTOR MEANS AS SAID KEY IS PROGRESSIVELY DEPRESSED WHEREBY SAID PALLET WILL BE MOVED FROM CLOSED TOWARD FULLY OPEN POSITION BY AN AMOUNT PROPORTIONAL TO THE AMOUNT OF DEPRESSION OF SAID KEY.