[Geoman]

So a continued websearch brought me to this reddit-thread: My latest 68K System: 50MHz 68060 with 32MB of RAM

I asked the OP to share the documentation about his Vigra MMI-210-Board, and he just did:

Been a while since I last looked at this, but I put what I could find before here: https://www.retrodev.com/files/vigra_mmi/

• hwmanual.pdf is the hardware manual for the MMI-4310 which is similar to the 210, but has 4 DSPs and 4 in/out audio channels
  
• dispatch.pdf is the manual for the DiSPATCH firmware package that runs on the cart. Mostly it's about interacting with that firmware, but it has useful information about initializing the card for user
  
• host-doc.pdf is about the software package that runs on the host system. It wasn't terribly helpful for me, but since it sounds like you've got the software this maybe what you're most interested in.
  
• tonedoc.pdf is about using the audio synthesis features of the DiSPATCH firmware
  
• mmi-210_tips.shtml basically amounts to a couple of minor addendums to the MMI-210 manual (which I couldn't find)