There are some reports of similar issues even with non-USB devices, so I suspect it is an ALSA bug. Probably not that hard to debug and fix, but I'm not clear that I have the time or energy for it.

On Tue, Aug 8, 2017 at 6:41 PM, Chris Caudle <chris@chriscaudle.org> wrote:
On Tue, August 8, 2017 5:15 pm, Paul Davis wrote:
> Tentative diagnostic: ALSA driver bug.

Isn't this a class compliant USB device?  Does the bug seem likely to
affect only this one device, or is this something that for some reason
other people have just not reported with other devices yet, but should be
expected to affect all multi-channel USB devices?

--
Chris Caudle


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