The MiniMoog Voyager Old School is a monophonic analog performance synthesizer based on the original Minimoog of the 1970s with expanded and modern capabilities. Like all other Voyager model, the OS features 3 high-range voltage controlled oscillators, 2 comprehensive modulation busses, 2 envelope generators, a mixer section, a 44 key keyboard with modulation and pitch wheels, and expansion ports along the top side. The most significant difference between this and other Non-OS Voyager models is its lack of patch memory and X/Y/A touch screen.