I have an MK-52, which I bought a few years ago very cheaply from an Ukrainian vendor on Ebay. It's interesting because it's programmable and even has a hardwar

I have an MK-52, which I bought a few years ago very cheaply from an Ukrainian vendor on Ebay. It's interesting because it's programmable and even has a hardware expansion slot (although those expansions are hard to get). However, the keys are a disappointment, they're quite mushy.