Recompile the kernel with USB audio support.
Please ensure that you *disable* => Devioce drivers => USB =>
USB audio and USB Midi.
Both are OSS modules and caused a lot of trouble here when
used in conjunction with the ALSA module
=> Sound => ALSA => USB devices => USB Audio/MIDI driver
BTW: OSS is marked as deprecated, but not the two OSS modules
mentioned above. Couldn't this get set or at least some info
that these modules belong to OSS?
Best regards
ce