I am trying to rebuild an expression box from an upright English
Steck Duo-Art piano.  Every manual I can find indicate that the two
pouch valves in the box are Themodist accent valves controlled by the
snake bite holes on the roll.  All the grey tubing has been broken away
so I am unable to tell what the other two sets of pouch valves are
tubed to.

Instead of just having two accent valves, this box has six!  The center
set seems to be teed together from tubing running over the top of
the box with a single tube control for both; the last two sets are
independent from each other and sit at the rear or supply side of the
box.

Can anyone tell me what these three other tubes operating four pouch
valves are connected to?

Clark McNally