Hi Hooper- I've been asking the same questions as well and have received the same answers as you. However, if you download the latest manual (version 2.1) of the CDSD from EMM Labs website, the picture of the the rear of the CDSD does show a USB connector next to the RS-232 connector. I'm sure this has no impact on sound quality so perhaps it is there for the software upgrades. I have done a software upgrade on my CDSD through a simple chip swap.
