While the FTP/NAS playback went nowhere — I have just wrapped up a 2+ month long move from Hokkaido all the way to Tokyo, with a job change at the same time — at last I have finally gotten a working changer drive with a working SPDIF port that would let me test the changer support of the firmware.

It is less finicky than the TEAC, albeit with more Quirk Flags enabled — then again, I presume any drive from the early to mid DOS era will be like that. If I manage to find the time to get it more stable, though, I might drop it in my primary unit instead of the regular drive I have in there, or build another one — now that I have more than one room, I could use more than one stereo, too :-)