via this auction
"Roland Jupiter 4 Midified in perfect condition and overhauled.
Work done:
- Factory calibration
- The 4 voices have been calibrated in factory mode
- The potentiometers have been cleaned and lubricated
- Keyboard contacts have been checked
- The volume potentiometer and the level of the L M H switch have been dismantled and cleaned.
- The entire keyboard has been cleaned perfectly.
- An additional test was also done on: The filter, LFO's, VCO's.
- It has 128 presets instead of 64
- Tuned perfectly"
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