Introducing the Mopho Keyboard by Dave Smith. 100% Analogue, 100% awesome! The Mopho Keyboard is a compact and affordable-but powerful-monophonic analog synthesizer. The voice architecture is similar to a single voice of the Prophet '08, but with a couple of twists to distinguish it from its award-winning sibling. DSI also added two sub-octave generators-one per oscillator-for additional girth and crushing basses.