Each peterson solid state switching system includes a sforzando terminal which, when energized, turns on all stops. Web traditionally organs use a diode matrix system with a 64 pair cable to the chest matrix board but recent much more expensive iterations use digital controllers with. Web it is also practical to add a diode matrix system to control new ranks that are being added to an old organ with an electropneumatic or other existing relay.
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Hammond C2 additions 4.