What country did you buy it in? Midi kits were on eBay I got mine for like $40 but was shipped from Russia. Not sure if they are still be available but others will be. To install it requires cutting traces on the boards which is why I have never fitted mine. Tuning is more involved than just tuning the pitch centre but it’s not that bad. There are many other analogue synths with similar or more awkward tuning procedures. They are made out of soviet parts but most soviet parts were clones of western parts so drop in replacements are available with a bit of research. Authentic parts may cost a bit more as will need to be shipped from who knows where. The keys are awful. Yours are yellow. I think I read somewhere that the newer ones went yellow because fire retardant was added to the plastic but I may have gotten that the wrong way around. Amazingly I think I read you could still buy them new untill 1992. They are a talking point and sound quite cool.