Mike, I just wanted to be clear for other memebers that don't know about the m2tech hiFace.
On the HRT I tested the first generation unit only and that worked perfect out of the box with nothing to install. Another member tested the second generation ASYNC unit and reported that it also worked. BTW you really want the second generation units as the specs revealed a better singnal to noise ratio due to the new ASYNC mode. However, that is just two units tested from the product line. No reason they should not work, but they need to be tested to be sure.