I think you guys may not be quite nailing the issue. There was an issue discussed back a couple of years ago with the Sony D50. The issue is with the version of the SPDIF standard that Sony implemented with the D50. I'll never be able to explain it properly. There are threads from maybe about 2 years ago where ToddR has explained it in great detail. It has to do with how Sony tweeked the 24bit SPDIF standard some years after it was initially implemented...and how the 's /p' in spdif is sony phillips and they were the guys that were developing the standard. They put out the D50 years after other manufacturers had released other 24bit SPDIF gear with the different (earlier) SPDIF version. But since Sony chose to use the updated standard on the D50, that meant the D50 didn't have backwards compatibility for SPDIF synching with gear that had used the previous standard. So, for example, the Mytek ADC192, AD2K, mini-me, and V3 all would not synch with the D50 because the SPDIFs weren't the same. To their credit, once this was discovered, Grace Designs started offering a free chip upgrade for the V3 that addresses this issue, but apparently it's not a real big deal because Sony seems to have been the only recorder manufacturer that used this later standard on one of their products. (Please don't hold me to everything I've said above...I'm a little fuzzy on the details, but this is the basic story.)
So, the above issue is unique to the D50 and Sony's insistence of using the newer standard on their own digital recorder. No word yet if they did the same thing on the D100, but if they listened to their consumers, they'd have moved back to using the same standard everyone else has used so that the D100 will work with the older ADC's.
It sounds to me like the issue with the Audient Mico is the same...or stating it more concisely the Audient Mico doesn't have an issue...it's just that it doesn't synch with the D50 because of the D50's SPDIF.