Adlung writes: A Koppeloktave 4' stands at present in the palace at Dresden in addition to an Oktave. Perhaps this means a Gemshorn 4'... Koppeloktave is also found in the stoplist [of the palace organ at Dresden] that Praetorius gives. Audsley, in his entry for Koppel, writes: �This valuable stop in the old Organs was sometimes labeled ... Koppeloctave or Koppeloktav when of 4 ft. pitch. ... The 4 ft. stop [is found] under the name Copula Minor.�

Copula Minor 4', Oberpositiv; St. Jakob, Prague, Czechoslovakia; Rieger-Kloss 1982.

Copula Minor 4', Continuowerk; St. Augustin, Vienna, Austria; Rieger 1976.

Copula Minor 4', Hauptwerk; Church of the Virgin Mary Before the Tyn, Prague, Czechoslovakia; Hans Heinrich Mundt 1670-1682.