One direction I get 60 VAC from internal ground to earth. The other way I get 20VAC.
---------- Post added at 00:33 ---------- Previous post was at 00:28 ----------
Just to clarify, the floating ground is not DC, it's AC.
---------- Post added at 01:07 ---------- Previous post was at 00:33 ----------
And now that I think about it, this AC voltage is present on a lot of other wires in the organ. Even the DC supplies have this 60 or 20 VAC voltage present on them (only relative to earth, obviously not internal ground).