As I understand it, KBM 2/3 on the PS2 can accept a variety of Yamaha midi keyboards but the original KBM only works with the KOC. But then if you wanted to play DoReMi on your PC the KOC is apparently incompatible with winxp drivers!
I guess the best option is to get the KOC and play on PS2 and if you fancied a bit of DoReMi then get yourself a separate short midi keyboard from ebay or somewhere, they can usually be found for pretty cheap!
This is the sort of position I am in right now because I really wanna play KBM but am somewhat low on monetary funds to purchase the essential items.....Bugger!!!
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