Hello All:  I just finished rebuilding a single-valve Standard
player action.  There are two devices on the right side of the pump
just under the motor tempo speed control that I have no idea what
they are for.  One is a 1/2-inch elbow fitted directly into the trunk.
The other is a valve that supplied vacuum through a 3/8-inch fitting.
I have no idea what they were for.

The only pneumatic device down there is the sustain which is feed from
a fitting on the left of the trunk.  The soft bass and soft treble is
controlled mechanically through the pushrods; everything is accounted
for, I believe.  I've attached a photo -- anyone have any ideas?

John Neiswinger

 [ Standard pump right side
 [ http://www.mmdigest.com/Attachments/16/07/18/160718_182053_Photo07171017.jpg