Had this icon for the last 7 years in my small studio. Serial Number 094918 dates it to August '81. Never gigged, although I purchased from a keys player from an '80's Aussie band and so it's seen some road use with scratches and marks here and there on the body prior to my ownership. Overall the synth is in good condition, fully functional, I have not had it serviced in my time of owning it. Arp is clockable via a trigger, no midi, 4 voices. Part of one toggle for 'wide' or 'normal' has broken off which is for 'Delay/LFO Bend', it still works and selects 'wide' or 'normal'. I am open to offers and would prefer pick-up only, or freight your care, but let's work out a deal if you are interested. {I'm selling to fund my trip to the Olympic Games where I am the personal coach of one of our athletes}

More info from wiki: The Jupiter-4's basic architecture consisted of four voice cards, each containing a: VCO, sub-oscillator, VCF (resonant low-pass which can self-oscillate), and a VCA. Modulation included an attack-decay-sustain-release (ADSR) envelope for the filter, and another for the voltage-control amplifier and a final level output with an overload LED. In typical Roland fashion, the filter ADSR could be inverted allowing for "upside down" modulation. The LFO was notable for being able to reach audio frequencies, allowing for crude FM and AM synthesis. The LFO is routable to a comprehensive amount of options, including: the bender, VCO pitch, pulse-width, both highpass and lowpass filter cutoff, and the VCA. The final VCA level setting could be memorized in user presets, and was prior to the overall master stereo output volume. Those settings were memorized in the user presets but a fully adjustable depth remained independently configurable through the pitch wheel to combinations of VCO, VCF and VCA, as well as a bend range. The master volume as well as the portamento are unmemorized as they're analog controls not linked to any of the digital control circuitry.