great project!
I immediately had an association for implementing something similar for korg DSS-1 (according to the DSS-1 circuit diagram based on HD63B03X - installing arduino nano should not be difficult and it’s easy to implement)! All that remains is to check the MIDI implementation chart between DW8000 and DSS-1
the DSS-1 circuit diagram see  there:  https://drive.google.com/file/d/17oAGBd8XjE5fB0oQps4Yi4UmF9N4dLsj/view?usp=sharing

http://www.buchty.net/korg/files/Korg%20DSS-1%20Service%20Manual.pdf

I installed arduino nano on EX-8000 and DSS-1 - and it turned out to be easier than it seemed when learning! Here is process of the installation to Korg DSS-1:

arduino is easier to install on the KLM-788 Jack panel. In this case, the power get near socket CN26B (pin#5 and #6) and you can break the cord of pin#2  for RX and TX connection by the MIDI connecting cord going to the main board KLM-781 CPU-II  - HD63B03X.

https://drive.google.com/file/d/14mo3EcSkTfE6uKRucdmmyQD4zfVidJgB/view?usp=sharing

https://drive.google.com/file/d/1HFgKfoweHuOlv_Y2G56s5leQDn0_Krco/view?usp=sharing

https://drive.google.com/file/d/1Of3SW8RS_1S5IX40r0XSb6N5JaTI9g5I/view?usp=sharing

the only thing I needed to recode was to change the device ID for DSS-1 - 0x0b, in line 34 of code

Hi Steve, great project., this is exactly what I was looking for.  Not sure if you are still familiar wth the hack as it was published 7 years ago ...

I am trying to resurrect my old DW8000 and remote control it with a masterkeyboard. 

I followed your instructions using an Arduino Nano Clone. 

Unfortunately, no luck so far: The note info is transferred, but it seems the CC/SYSEX transformation does not work yet. 

On github you had set the midi channel to 1  - so changing dwChannel to 1 should allow me to operate with midi channnel 2, correct? Or did i miss other places where i need to adapt?

// 0 here is 1 on DW-8000 - need to set Param 83 to 1

const int dwChannel = 0;

I use firmware level 13  - are you aware if this may be an issue? (I used the windows ctrlr app for the dw8000 device which works sending out sysex messages so I dont think this is an issue) 

Any help is appreciated, thank you again for publishing your work!

I converted your code to a firmware for the Retrokits RK-002 cable, if you want the control but do not want to do the hardware hack this could be a nice solution: https://www.retrokits.com/rk002/exchange/57b9a5c1-f2aa-46c2-8654-8be9426f22d7/

I've been using the converted code on my RK-002, as far as I can tell everything works perfectly with my DW-8000.

Neat - I could see this being useful for other minimal-interface synths, like the Poly 800 or the Sequential Six Trak

and the same for Korg DS8; DSS-1