All Aeolian valves must drop from a vertical position in order to seat
properly.  After a grand has been moved (presumably on its side), the
valves must be re-seated.  Uprights, too, if the piano has been tilted
or the stack taken out and replaced.

The procedure is really quite easy.  Simply blow air into the tracker
bar.  Gentle lung pressure is enough -- never use compressed air, which
at high enough pressure can rupture pouches.  Then run the repetition
part of the test roll several times to make certain that all the valves
are seating as they should.

Early Duo-Art stacks have 88 notes and often present a special
problem.  To simplify tubing, sometimes the 4 extra notes at each end
are permanently silenced by plugging their nipples where they enter the
stack or using tubing loops connecting pairs to each other.  Hopefully
more drastic steps have not been taken, and these 8 notes can be made
to repeat until proper seating is assured.

Jeffrey Wood