You can use the Pedal locals to set and recall combinations of Pedal stops in the same way that Great local pistons do with Great stops. These appear either as toe studs located to your lower right just above the pedal sharps, or as thumb pistons situated to your right underneath the lowest manual. They are rarely present on smaller organs.
After pulling several stops in the Pedal:
To see if your combination was saved, press cancel, and then press Pedal local piston or toe stud 5 without the Set button. It should now have recalled your stop combination.
To Pointer Screen