Yeah, someone over on Macintosh Garden was suggesting it was a Digital Audio. I made the mistake because Wikipedia groups that one in with the Quicksilver G4s, shoulda checked a little further.

I'll have to see, then, if I can't grab a used PC board with a 4x AGP slot in order to flash it. I'm not worried about wrecking it, don't have any other use for it...
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Power Mac G4 (OS9/OSX.4, 200GB HD, 2GB RAM, PPC 7455 @ 2x1.25GHz)
Amiga 1200 (KS3.1/ClassicWB3.1, 4GB HD, 34MB RAM, 68030 @ 40MHz)
Sony HB-F1XD MSX2 (64KB RAM, 128KB VRAM, 720KB FD)