A monophonic, analog synth prototyped by Octave-Plateau during the development of the Voyetra 8. It used the same voice architecture as the 8. It had more front-panel controls than the 8 did, and would have served as a programmer for the 8 (which badly needed one), in addition to being a synth itself. It also had a built-in sequencer, which could drive not only the One itself, but an attached 8 via the VPK keyboard bus.