Regarding your AMPICO problems... If you are having "cancel" problems, AND
INDEED you do HAVE the "A" style Automatic Cut-out with the finger pneumatic,
then we shall proceed from here..........

     You can only clean out the Auto Cut-out by "backflushing" it.  The
Tracker Bar Pump is useless except for the Note Playing Holes.  There is a
screen system inside (which I am sure you of course know) that catches the
crud inhaled by the tracker bar openings.  OK so far?  One must de-tube the
Auto Cut-out and one at a time and (on the component side, not the Tracker
Bar side) BLOW through the tube to clear the residue or lint or paper
punchings caught in the screens.  NOW, if the #7 (cancel) is the culprit (it
can be), you cannot simply do the above procedure 'cause when you blow all
you will blow is AIR THROUGH the Auto Cut-out because the finger pneumatic
has an opened a "T" in the line.  So... one must at this point (since
obviously the piano is "Off" and the AMPICO on/off switch is not functioning)
either put one's finger OVER the holes covered by the the finger pneumatic
when the AMPICO on/off switch is "On",  OR  simply press the tiny Cut-out
pneumatic closed and THEN BLOW (from the component side) to clear the
build-up, if indeed this is the problem.

     NOW, you also have the possibility of (Gasp, sign of the cross with
crossed fingers)  PERFLEX POUCHES!!!!!!!!!!!!  I seem to recall that you had
some mention of these in the  past.  If you have even ONE "blown" pouch in
your AMPICO expression system, forget it.  Also, if your gaskets were not
replaced under the expression blocks (AMPICO "A" expression units), then
there can be all kionds of queer activity under your bellycloth.   Weather
changes and too shallow a pouch dip and all kinds of details make for FUN FUN
FUN.  Trace those cooties down, Terry. and let me know what you find.  It's
great.  Always the hunt is more interesting than the catch!
      By the way,  the above recommended search and destroy procedures become
CONSIDERABLY more difficult when one has modified the original instrument to
"improve" it or if has been digital-fied.  Good Luck!

Robin Pratt