This unit is an absolute amazing find in this condition. All keys work as well as all button functions. It takes some time to warm up and function correctly and when it does, the sound is second to none of its era... Mellotron, Chamberlin and Orchestron take a back seat. Someone has removed the left channel input socket so that it operates as mono, I have no idea why. Sometimes it takes a couple of hours of being on for the circuit to stabilize but once it does,... it sounds incredible and has no problems whatsoever. I am listing this as accurately as I can since I cannot find a schematic online or anyone local to give it a look over to see what is going on exactly. It is in superb shape and one of the most difficult to find keyboards as they only made them from 1982-1984, less than 200 overall units made in California. This unit's MSRP in 1982 was $3, 900, on top of that, included is the 16 string orchestra chip that cost over $860 alone. At $4, 760 plus tax, that was a serious investment which made this almost exclusively a unit bought by recording studios or professional musicians. This unit really needs to go to someone with some real skill or a studio, neither are me. Prefer local pickup, but shipping can be arranged at the buyers expense. This unit comes with a locking hard case that fits it pretty well but will require additional packing if the unit is to be shipped. Understand please that I have described this unit exactly as it has functioned for me and due to its age, it will certainly need some work in the power supply and to wire the left channel back in to circuit. I can arrange pickup with 200 miles of Bloomington, IN for a reasonable cost. Please do not hesitate to contact me with ANY questions you might have. Please check my feedback to see that I have been a member since 1998 with 100% feedback. I have not sold anything in several years but I have simply been too busy raising three children. Now the last has graduated and I am going to be moving most of my collection of unique and vintage gear. https://encyclotronic.com/uploads/monthly_2017_03/360ad.jpg.18c42f36e8e533d2e3c5e308cd1b99d0.jpg https://encyclotronic.com/uploads/monthly_2017_03/360ad2.jpg.0313527270d53eb2925c6b61b9b3bda1.jpg https://encyclotronic.com/synthesizers/360-systems/360-systems-digital-keyboard-r1279/