My only sound device is an Esoteric D-07X DAC. It's connected to the PC/MC via USB.
All I do when bringing up a new system in follow the DAC manufacturers install instructions for installation of the USB driver.
Once installed and the DAC is connected, the DAC Driver always appears in "Output Mode Settings" -> Device. Once the Device is selected, I'm off an running.
As I recall "Exclusive" is default.. then I can tweak as needed, but, that's basically all I do.
One thing I always seem to have to do is with the USB Driver and DAC connected, I have to go into Windows "Devices and Printers", where I can now view the newly installed Audio device, right click, select sound properties and then proceed to selected the formats the device will support.
At one point I didn't think these driver settings did anything..and I've not tested to be sure now as I just as a rule go in and set the formats that the device supports.
I've been traveling and still have not read through the thread!.. sorry if this is redundant and/or unhelpful.. Good luck!