Today I had a session at a friend's studio. He is running ProTools with an HD-X interface and two HD-192 interfaces. I brought my computer, which I had used to mix the material we were working on, and attempted to output stems in Cubase via the ADAT outputs of my MR816x. No matter what we tried, we could not get a signal into ProTools.
I did set the Digital I/O section in the FW driver to "ADAT" and also tried the Optical S/PDIF setting. Nothing. We played with settings on the MR816x and in ProTools for over three hours trying to figure this out.
Finally, just as an experiment, I connected a Prism Orpheus that my friend uses for location recording, loaded the drivers on my computer (Windows 7, Cubase 6.5), and loaded Cubase. I assigned the ADAT outputs on the Prism and we got audio right into ProTools, no fuss, no muss.
So... is there something wrong with my MR816x? Is there a setting I missed? Are any other folks here using the ADAT outputs?