Thread
All I can say is, good luck!
Some info (very outdated, but possibly relevant still) here: http://www.harmony-central.com/Computer/macavfaq
Some info (very outdated, but possibly relevant still) here: http://www.harmony-central.com/Computer/macavfaq
If you're already familiar with general DSP programming under *nix, deeply intimate with scraping-the-silicon level development for mid-90s Mac hardware, and can find the documentation for all of the above and the Motorola 56001 series ...how difficult
... not very