Actually, I have no right to say usb audio device now.
The usb audio device, which I wrote here, was replaced by
a new model Onkyo Wavio SE-U55GX, and it is quite different
from its older model, SE-U55X(?), that is the new model uses
different chip etc.   However, it works for me, I only listen music
from CD, because I cannot live with mp3 etc compressed
music format for classic music.  It too bad to here.  The new 
model has standalone mode, which means I can listen music CD
even usd/usbd is not working!

After that, I have no time to try USB device again.

Kenji