David Storey on February 17th, 2021:
Stop action on the Walcker tracker organ is electro-pneumatic with a small diode matrix combination action.
Database Manager on July 8th, 2011:
Updated through online information from David M Storey. -- More than 10 years ago several stops were added to this organ in a free standing case to the right side of the main case. These are on electric action. The organ was, within the last 3 years, in need of competent repair and maintenance however it was fully functional and in regular weekly use. It is all cone and scroll tuned except for the great mixture which has tuning slides. The stop action in the main case is electro-pneumatic. Originally the organ had a "frei-combination" system with an A and B piston. This was replaced with a diode matrix system at the time the new stops were added.
Database Manager on October 30th, 2004:
Electric stop action.