The Duo-Art rolls were coded appropriately for the notes being
played.  There is _no_ problem due to so-called "droop".  There
are an initial 256 volume possibilities for each note and/or chord.

There are many more possibilities, if one is dealing with certain
models of the fan-expression system first marketed in 1928, and
available on top-of-the-line Duo-Arts until the last were
manufactured.  These systems were not intended as replacements for
the standard system Duo-Art, nor do they require special re-coding
to access their added capabilities.

I am looking at one original Duo-Art roll right now that uses double
Theme perfs for the treble notes being played and at the same time
uses single perfs for bass notes being played at the same moment.
The volume output is different in the treble and bass, as the coders
intended.

Rolls using note size holes for Theme can not achieve this, not to
mention the loss of speed in volume changing that results from the
use of the wrong size theme holes.  In recent years many Duo-Art rolls
that do not use original size Theme perfs have been marketed, which
are incapable of operating the mechanism properly.  The problems that
Mr. Baxter speaks of should not be blamed on engineering shortcomings
of the Duo-Art system.

Fortunately, Julian Dyer is managing to cut Duo-Art rolls that look
and work like the originals made in the 1920s.

Bruce Grimes