synthesizer with a very minimal patch, which uses 3 oscillators and a sequencer… seriously, i used a synthesizer very similar to this when i took my first class in electronic music, back in the early 1980s. once i had figured out what i was doing, i created patches that were so complex that you couldn’t see the knobs because of all the patch-cords… and one of them used two wires to connect to a separate device, an oscilliscope, that drew a smiley-face on the screen… 8)