KORG MS20

images via this auction
"It is the original factory built 240V AU/UK/European version with original moldered Australian plug and can safety be used in all countries with 230/240V such as AU.UK and Europe. This is a huge advantage to buying one of the 100V MS-20's from Japan

Originally, the filters used Korg's proprietary KORG-35 chip. Later, the filters were redesigned to use off-the-shelf LM13600 OTAs. MS-20 fitted with LM13600 filters have a small daughter board. This one here has the later filter (the small screw above the VCA graphic on the outside it's a newer filter, if it has no screw it's a korg35. That screw is what holds the daughter board for the newer filter. )"