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This SCI Pro One is in excellent condition. It's fully functional and sounds great. It just got back from a full servicing by our tech. Servicing included rebuilt keyboard, replaced all electrolytic caps and full tuning/calibration. All keys trigger properly, pots are clean and switches all working. This is the more desirable J-wire keyboard version. This is a classic awesome sounding mono-synth.
Sequential Circuits Pro One Owner's Manual