"The Multimonika was a commercial hybrid electronic/acoustic instrument manufactured by the German company, Hohner GmbH and designed by the German instrument designer Harald Bode . The Multimonica was a two keyboard combination of a wind-blown reed harmonium instrument, controlled by a 41 note lower keyboard, and an electronic monophonic sawtoooth generator contolled by the upper keyboard. The Multimonica was marketed in Europe from 1940. "
found at the audio playground keyboard museum.
go to keyboardmuseum.org
