Organ reform movement
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The Organ Reform Movement or Orgelbewegung was a mid-20th-century trend in pipe organ building, originating in Germany. The movement was most influential in the United States in the 1930s through 1970
Holtkamp Organ #1,939 (1978–2015) at University of Notre Dame
Registration (organ)
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Registration is the technique of choosing and combining the stops of a pipe organ in order to produce a particular sound. Registration can also refer to a particular combination of stops, which may be
Combination pistons (buttons) on the organ console
Left-half of setterboards on the console: two rows of register rocker switches for two free combinations per manuals or pedalboard (Organ at the Liebfrauenkirche Ravensburg)
Toe studs (pistons) on the console: center: Sequencers "<" and ">" right: Combinations "1"~"8"