You can usually get a decent DW-8000 for around $250USD. Crazy that the module can fetch $100 more, but that's the trend right now. Oddly the EX-800 usually goes for nearly $100 more than the Poly800 as well, but the Poly does not have Velocity and Aftertouch keys.
I just can't justify buying a 8000 because of all that Mike pointed out.. BUT if I had the knowledge to do so, I would get the filter board out of one and design a brand new voicing system for it using a ARM 32bit uC.
Actually, I already do have a filter board from one, but I have pulled all the NJM2069 chips out and eventually hope to get around and build a few Filter modules I have planned with them using this
MPA | Highly Liquid Blog
![\"image\"](\"https://ec.yimg.com/ec?url=http%3A%2F%2Fhighlyliquid.com%2Fup%2Fmpa-b-proto.jpg&t=1572481869&sig=Qv3qiDCK5QTM1WXb4lf0mg--~E\")
.. basically making it a MIDI/DAW controllable NJM2069 filter module to plug a external signal into.. but I'd gladly solder them all back in if a new voice could be ran on the entire 8 filter board.
The Korg board has some kind of S&H setup on it to route the voices in from what I can tell.. so I'm guessing it would take some kind of timing to cycle each voice, one at a time into the board... triggering CS's and all that in perfect harmony.
/Blaine