If anyone is running dig-in to this unit, I've noticed my Hosa cables don't fit the input all that well, they're pretty loose. I thought it might be just one of the cables, but I tried both of them/both ends, the connector on the Hosa fits very loose. I was transferring a show tascam>671 and I noticed some drop outs in the master. I ended up being the cable connection, if I even moved it very slightly it'd loose signal, it just doesn't fit tightly at all. I'm just posting because I don't want someone to trash a nice recording in the field, it might be common sense but if you're recording through the s/pdif make sure your cable fits nice-n-snug.
My cheapo rat-shack cable fits tight and another with canare connectors, I don't think it's the unit, I thing it's Hosa's cheapo connector.