I am using Audiolab CDQ connected to Macbook pro via M2tech Hiface. I am using iTunes with Channel-D Pure Music software. In Mac settings I have selected Channel-D as output option. And in Pure Music audio settings I have selected M2Tech Hiface with maximum up sampling. The result is when I play music the Pure Music displays on top of iTunes shows: M2Tech USB 2.0 Audio Out 64 bit up sampling to 192KHz(maximum Fidelity SRC). Sound quality is really very good. I do not know if the display 64/192 is correct. Can anyone explain this. Suddenly one day I changed to above settings and was taken by surprise by improvement in sound quality. When I looked at the display in Pure Music display I saw 64/192.