My VX-1 arrived and sounds AWESOME using a USB in from my macbook pro and driving Polk Monitor 30 speakers for my office. Question: I cannot seem to figure out the "auto on" feature that the poorly worded manual alludes to with USB. I've tried various uses of the on/off button and cannot get the amp to do the "breathing" (which I think means pulsing on/off). Rather, all that happens is the USB light blinks.
A small detail, though. All in all, a very nice product and very happy with it!