Ondes Martenot
The instrument's movable keyboard is modeled after the keyboard of another early electronic instrument from France, the Ondes Martenot, invented in 1928. The Ondioline does not feature a ring (or ribbon) controller to control pitch, as the Ondes does. Instead, the Ondioline has a strip of wire, that when pressed, provides percussion effects, but it cannot produce the Ondes's theremin-like pitch effects.