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Finally my Focusrite audio interface is visible as audio device, when I've installed kext that enables USB 3.0.
On other ports my USB is only recognised as USB, not audio device.
But the problem is sound from the interface is distorted and crashing/stops playing after few seconds.
I've read that deinstalling GenericUSBXHCI.kext solved problem for others, but how can I enable USB 3.0 ports/Fix USB ports without this kext?

It could be important. I have:

As Rock
960 GM U3S3FX Motherboard


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