The classic first monophonic analogue synth made by Roland in 1973. An unique synth which has a big sound (basically one quarter of a Jupiter 4)! The tab switches all function - missing two tabs (which others online have 3D printed). Some surface rust under the paint which is usual for this age of synth which I've inhibited. Check out Wikipedia for a list of users of this synth, such as Jarvis Cocker, Blondie, The Human League etc.