I have used Bruce Clark's instructions several times and found them
quite helpful to regulate my late Ampico A Symphonique grand, circa
1928.  ( Ref. http://www.player-care.com/ampicreg.html )  I have also
found other MMD posts about Ampico A regulation and yet have not found
answers to two, perhaps obvious, questions:

1. Because of the split stack, most instructions say to test Brilliant
- Medium - Subdue pressures on the bass, then repeat and test the treble.
All say that "results should be the same at both bass and treble,"
however I have not found one article with instructions on what to do
if they are _not_ the same.  I assume either the bass or treble spring
pneumatic needs to be adjusted, however, I'm not sure whether it's up
or down.  Perhaps, too, it's the collar on the spring pneumatic?

2. The Ampico A test roll has a test for crescendo opening and closing
speed.  The 1919-20 manual lists a small "set screw" for adjusting the
crescendo speed.  However this "set screw" seems to have disappeared
on later Ampico A.  There are, of course, the crescendo springs which
adjust the first intensity but if these are for the first intensity,
and there is no set screw anymore, how does one adjust the speed of
slow and fast crescendo to match the test roll protocol?

Adam Aceto