James, your device reports that it could send 8192000 bytes per second:
>  wMaxPacketSize     0x0400  1x 1024 bytes

The driver believes this, gets confused, and uses URB sizes that are
much smaller than appropriate.

I'll fix this in the driver.

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https://bugs.launchpad.net/bugs/1191603

Title:
  raring-updates: regression: 3.8.0-24.35 causes sporadic failure of USB
  audio devices

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