Maybe a special driver from A & H could optimize the performance and lower the latency under OSX.
and maybe allow 16bit 44.1 KHz 😉
It seems it is just running with Core Audio, as there is no special driver for OSX like the ASIO drivers for Windows.
There are some good and fast USB 2.0 audio interfaces out there, but the really good ones use their own optimized drivers for Macs.
But maybe I just have to accept the fact, that the QU-16 is developed first of all as live mixer and not really suitable for DAWs.