I have bought burson conductor from www.audioaffair.co.uk. I use it connected to my macbook via usb.
Problem is that sometimes it doesn't get recognised by computer. It doesn't appear in usb devices list.
I tried to connect to another computer, swapped usb cable, nothing helped.
Usually it starts working by itself. It seems that leaving amp turned on for a while helps somehow.
Unfortunately this malfunction isn't always reproducible. Often amp works...