General point: there will be no linux support for USB2 audio devices
that looks anything like what currently exists for USB1. There is no
"class compliant device specification" for USB2 audio at present (and
my guess is that there will never be one). This means that just as
with PCI devices, each and every device (or certainly each and every
chipset) needs its own distinct driver, written one by one by one.
Yet another incredible SNAFU from the audio technology industry - the
folks who bought you MIDI and then lost the plot, started squabbling
amongst themselves, and then the show was cancelled.
--p