Finally got lucky at one of the (rather crappy in general for PC/sound stuff) local second hand stores, and scooped this up for 15 Euro:
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Little used E-mu/Creative Labs Proteus X2 Virtual Sound Module complete with all CD-ROMs, manuals, and USB/MIDI interface/DRM dongle. The interface/dongle works and can also be used as a stand-alone USB/MIDI interface. I still have to try the software.
Then I found this online: http://www.creative.com/emu/proteusvx/ and my day got even better. 😁