diki.. for your know, Ribbon connectors and USB cables are more secure, simple to change, to manage and easy to find for spare parts than the old system insicure cablages than have the Oasys:
http://www.karma-lab.com/oasys/o_int.html try to remove one of this custom cablage/connector and IF for pure case you will broken just one single wire from this special custom connectors...you have to cry!
For sure each of the Oasys parts are developed from Korg and then for just one stupid 20 cents cable you have to ask the original spare parts from Korg.
How much you will then cost? Phone calls, shipments, authorized personal only..
maybe just for one floppy ribbon cables that you can find in ANY PC store?
For me ( my opinion) the Wersi are much better hardware developed than the Korg.
Oasys is still OS propietary and you can not upgrade the mainboard ( old 32bit Pentium)
Look around in the Oasys forums how many people had try to upgrade it without success.
Every time you will upgrade the mainboard under Linux OS, you have to change and managing a lot of new packages/kernels.
Under Mediastation we made another 3 months of kernel/packages work, just for drive the new HDMI interface, CPU Dual/Quad core for the new AM2+ Mainboards..
here one small OS example update JUST for the Linux OS drivers...:
http://www.lionstracs.com/data/changelog2011.txt Not so easy..believe me...
cheers