Korg DW8000, Mono/Poly, MS-20...

Heyo,

I just recently acquired a DW8000 for $15. Solid! However, the owner 
said that while the keyboard had been in storage, it has sustained 
heavy water damage. The keyboard looked mint, so I scooped it up 
anyways. If it didn't work, no worry, was worth a try.

Well, I get it home and realize he'd left the old C or D batteries in 
the back, and they'd leaked everywhere. I took them out, plugged the 
machine in, and fiddled around. I've never used a DW8000 before.

It was making noises, but the only noises it would make when I 
pressed any key was this siren-esque descending BBEEEEEOOOOOOOO. I 
decided to crack it open and replace the CR2032 battery.

Ouch.

The case was literally filled with rust, but it appeared that every 
single component was still in the right place. It looked like the 
only damage done was to the metal bottom! I spent all day cleaning it 
out, and I replaced the CR2032 battery. (I hope my amateurish 
soldering jobs were okay!)

I fired it up -- yep, still powers up and looks fine -- and I tried 
using a SysEx program to load on patches. I can tell that MIDI is 
working, because I can control the DW8000 with my computer. 
Unfortunately, I've tried loading a bunch of different SYX sets, and 
still all I get is that obnoxious siren noise. Any ideas?