The Aeolian
'Duo-Art' (upright piano) EXPRESSION BOX
It's
hard to believe that something akin to The Ugly
Duckling - hidden inside upright and grand pianos
- could be the source of such exquisite expression, given
special music rolls which challenge the system. This is
where the dynamics for the THEME (solo - released via valves) and ACCOMPANIMENT
(the rest of the keyboard
intensities) are created ... either through
perforations on the Duo-Art roll or via the Pianola levers
next to the keyboard. Aeolian called the latter "The Duo-Art as a Pianola".
On the lower left you see the Accordion Pneumatics,
which "squeeze" and tug on the same levers which are
available to the human roll interpreter. The accordion
spacings are 1/16", 1/8", 1/4" and 1/2 inch (approximately Mezzo-Forte
with only a few notes being played). These are additive,
so are called 1, 2, 4 and 8, giving a range of 15 dynamic
possibilities, for whatever activity and 'chord sizes' are
being dictated by the music roll. (For example, an intensity of 5 = 4+1, a
dynamic of 10 = 8+2 and a "crash" (sforzando) would be
8+4+2+1 holes on the tracker bar for the roll, or the
THEME lever being moved to the fullest position.)
The
THEME and ACCOMPANIMENT are independent of each other,
so have 15 levels each separated by the "solo accent"
holes on the rolls and/or the levers for the Pianolist
(roll interpreter).
This is
a simple idea carried out to extraordinary extremes. The
vacuum from the pump is regulated by this unit, so the
equalizers (above the accordions) move in accordance with
the musical demands.
Aeolian told its dealers in 1918 (and we have a copy of that
text!) that "The Duo-Art as a Pianola" (meaning
manually controlled) could outperform
even their finest Pianola Pianos, which meant Weber
and Steinway in those days. The lever controlled Duo-Art
requires a musician and one who imparts his/her will upon
the music. Once learned on an instinctive basis, the expression
unit - with sliding knife valves - usually reacts more
rapidly than the Accordion Pneumatics "pulling" on the same
rods.
Arrangements which take advantage of the
solo effects, the "crash" valve (when the player is so equipped) and the
levels of the THEME and ACCOMPANIMENT are usually memorable. They
are not "reproductions" of a pianist at the keyboard as
claimed by the piano companies, but a homage to hand playing
and an artistic musical alternative in their own right. The
Pianola levers give the user the opportunity to cut in or
take over the automatic performance, as it's often necessary
to 'fine tune' the arrangment to a particular piano.
Patents were taken out by the Aeolian Co.
around 1913, and the flow of instruments began in earnest
nationally starting in 1916. From then on to the early
1930's, the Duo-Art had few rivals since this unique design
stayed pretty much the same over the years. Cumbersome that
this unit appears to the viewer, it follows musical principles
so continued to function as musical demands changed in the
following decades. Today,
in the 21st Century, people continue to enjoy Duo-Art
players ... featuring a pneumatic wonder with moving rods,
pneumatics and valves hidden inside ... and this is
the heart of
the instrument.
--L. Douglas Henderson
ARTCRAFT Music Rolls
Wiscasset, Maine 04578
11-9-2011