$380 is not that cheap for the Polysix, but if you want it: Kits at 200, assembled 380 us$. thats why there is 2 versions – Den Polysix kann man midifizieren, billig oder aufwendig:
Korg PolysixM (extensive and expensive) – $380 installed, $200 kit.
KORG Polysix MIDI (cheap and simple) – $70 installed – MIDI In only
Matrixsynth posted about Polysix Midi posted in this thread: