It does not appear from any evidence that the keyboards - when there were more than one - of the early organs were arranged for transposition, but it is certain that the Flemish harpsichords to 1650 were made with double keyboards to accommodate it (see Hipkins' History of the Pianoforte, 1897).
harpsichords הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד