[pianotech] Conversion of regular player to DUO ART player

[Berley Antoine Firmin II]

Duaine, you would have to make the Simplex stack MUCH more less simple! The 
Duo Art, while having a divided stack at notes 44/45, uses a different 
expression than the Ampico or Welte simple Bass and Treble expression 
levels. The whole stack is usually connected to the vacuum supply for 
Accompaniment, which is controlled by 16 levels of vacuum. The Theme only 
comes into play (on either bass or treble) when the Theme is energized by 
the snake-bites, delivering 16 levels of Theme anywhere on the keyboard.
Berley A. Firmin II