Still searching for this answer myself (albeit w DR100mkiii)...I've purchased two cables now one of which seemed to result in some 'popping' indicative of a bad transfer, and the other (generously and skillfully made by a member here) has thus far produced recordings without digital artifacts.
I think the answer here could be settled somewhat by whether or not the Tascam has the ability to sync its internal clock with an external source which, up until now, I've not been able to figure out.
Anyone here done any more with attempts to connect a MicPre/D digitally to their DR100mkii or mkiii?
Thanks!!