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
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