Thanks for all the great insight on this DAC / Amp, I'm strongly considering purchasing it in favor of other external DACs such as the Audioengine d1 or Aune models.
One question I had, for owners of the device, is regarding the volume control. Is the volume control 'software' based, i.e. driver-dependent, or does it occur post digital conversion in hardware? In other words, when turning the volume knob, does the volume level in Windows or in the device's driver software move, or is it an entirely analog adjustment that uses a built in amplifier? Hopefully the way I've worded this question is clear, I'd really like to know.
The other thing I was wondering was regarding Mac compatibility. I use both Windows and Mac, and although I'm sure the dolby functions, driver software etc. probably wouldn't work with the Mac OS I was wondering if the basic audio functionality and volume control works. The manual for the u7 says that it's supposed to work with Macs in USB 2.0 mode, which is a little counterintuitive since USB 1.1 is usually 'driverless', but in any case if anyone has tried fiddling with the device on Macs I'd be grateful for any insight you have.