I tried this while still testing the Sonosax, since the toslink output is also active. My D50 does show a digital signal in, but it says it is getting a 44.1/16 bit signal. The clock, however, is running way fast, so I assume it is recording a higher sample rate with the wrong flag. The Core Sound Mic 24/96 had the same issue with the Sony, took them forever to "fix" it, also the V3 years ago (they fixed it very fast!).
Jeff