http://www.korg.com/SupportResults.aspx?productid=214
Now, this seems strange. I thought that there is no way of connecting a Mac or PC directly via USB to an Oasys. The site doesn't offer lots of additional info on this driver. Does anyone know what it is good for? Could I save a USB-Midi-Interface with that one?!?

EDIT: you have to click on "downloads" after you've followed this link - couldn't provide a better direct link.

They mention the Kaossilator there too?