Has anyone been able to make a Korg 1212 card work in Mac OS 9.1?

I have mine in a beige G3 tower. It shows up in the system profiler, and it works in OS 8.6 (in a separate partition), but not 9.1. When I try to launch the 1212 utility (2.0.2b), an error message says the card is either in use by another application or is not in the socket.

Any clues out there?